Who Should Start Bradley or Brown?

[GreenWarrior]

brown should start over crowder.

[Bostoncelticsforlife7]

brown should start over crowder.

Hell no crowder needs to start forsure there is absolutely no arguement for crowder not to start

[ImShakHeIsShaq]

I don't care, it's CBS' job to figure it out, I just want wins! I do want to say, people are crediting the wins to JB starting while I think it has nothing to do with who starts in that spot and everything to do with Smart being back on the bench! He leads that group and gives them the calm that they need. CBS didn't put Smaht back on the bench b/c he was worse than JB and holding the starters back, he put him there to orchestrate on both ends for the bench. If we had a capable PG on the bench, Smaht would still be starting while AB is out.

Who said it was because of Brown that we won those games?

Quite a few people and not only that, why mention it if some don't think him starting is what leads to those wins? Why would it matter at all if that wasn't the case?

If you say it's about AB helping the bench's scoring then you have to advocate for It4 to be there because he is one of the best offenders in the game. Surely, he could help that much more than AB can.

Personally, if him starting is the formula for us to win, I hope CBS would keep him there and I don't care about who is better or who has been here longer! The goal is to get the best result by using the right combination of what you have. I trust that CBS will do what's best for the team and he definitely knows more than I do about what that is. Heck, I would probably be starting KO or JJ but I'm not the one coaching a team to 2nd in the East (basically 3rd last season... ugh). CBS has it under control and I'm rolling with w/e he decides.

[mmmmm]

Bunch of ingrates 

That aside, Avery is a better player than Jaylen in almost EVERYTHING.  We start the better player, plain and simple.

The best way to screw up this team's chemistry and send us back down a sh!tty path is what you guys are advocating.

Anybody remember Ray Allen/Bradley/Rondo/Doc fiasco?  I could even stomach that one because Ray was injury prone and at the tale end of his career while the young Bradley was starting to come into his own but it messed up the team's chemistry which eventually led to Ray signing with the Lebron. 

Jaylen is a f'ing rookie for godsakes...a rookie with many flaws still, starting in place of someone clearly better and someone with the longest tenure here.  ****H.

That's not true . Brown as a rookie is already stronger, longer, healthier, better slasher, has more upside and more versatile defensively

Stronger?  By what measure?

Longer?  True

Healthier?  He hasn't log as many minutes so I wouldn't say so

Better Slasher?  LOL...ummm...NO

Has more upside?  We'll see in couple years or so

More versatile defensively?  NO

How about we talk things that are tangible and more important to this team such as offense, defense, rebounding, 3 pt percentage, perimeter defense, FT shooting percentage, experience, playoffs experience,...you know, those things Bradley is CLEARLY better at than Jaylen?

Stronger? Yes, he has 40-50lbs on him LOL
Longer? Yes
Healthier? So far, yes
Better slasher? Arguable but I would say yes. Avery mainly drives off of cuts and Jaylen can get to the rim seemingly at will and already is a better finisher
Higher upside? Yes
More versitile defensively? Yes
Seven game win streak? Yes
Bench is inconsistent? Yes
Brown plays better with starters? Yes
Smart and Bradley coming off the bench? Yikes
What else needs to be said

So much fail in this post I don't know where to begin.  And the fact that you completely ignore the last part of my post says a lot.  You didn't put up anything worth arguing so I won't even bother.  Seven game win streak...smh #palmface

You were wrong on almost every single question you answered. And I'm not saying that brown should play more minutes than Bradley. Bradley should get he same amount of minutes coming off the bench and brown should get 10-15 minutes starting. Bradley is no doubt the better player, but when you consider the several factors like our young inconsistent bench, the advance stats that show that Avery and Isaiah aren't a good pairing defensivly, Avery has played his best basketball coming off the bench, Jaylen is playing A LOT better starting, playing better defense and consistently scoring double figures, and Jaylens superstar potential, you have to consider it

To be fair everyone is a bad defensive pairing next to IT.

Here are the 9 5-man units that the Celtics have played at least 50 minutes this year, sorted by defensive rating (points surrendered per 100 possessions):


Unit             min    ORtg   DRtg   NetRtg
TR+MS+JB+JJ+KO   59.2  100.0   94.0   +6.0
IT+AB+JC+JJ+AH   50.0  114.1   97.1  +17.0
IT+AB+MS+AH+KO   74.9   99.4  103.8   -4.5
IT+MS+JC+AH+AJ  118.1  119.6  107.2  +12.4
IT+AB+JC+AH+KO   59.2  127.6  108.3  +19.4
IT+AB+JC+AH+AJ  251.4  115.6  109.8   +5.9
MS+AB+JC+AH+AJ   63.3  120.5  111.6   +8.9
IT+MS+JC+AH+KO   71.8  120.7  120.8   -0.1
IT+AB+MS+JC+AH   63.9  116.3  127.1  -10.8


The team's overall defensive rating is about 109.2.

Thomas is on 7 of those 5-man units.  Five of those seven range from team average to really, really excellent.   This suggests that, no, not everyone is bad defensively pairing next to IT.

It is useful to look at the worst lineup (both by DRtg AND Net) and compare it to the second best lineup (also in both categories).  The difference is simply swapping in Jerebko for Marcus.   That simple change, which has nothing to do with Isaiah, transforms it from a cluster-mess to a really excellent lineup on both ends of the floor.   

The difference between those two also isn't because Marcus is a crap defender and Jerebko is a super-elite one, either.   The difference is the worst lineup has both Marcus and Jae playing 'small' and out of position whereas the swap transforms it to a conventional lineup, with everyone playing their normal position.

For the purposes of this particular thread, it is probably also important to note the top defensive unit (which is the 5th best NetRtg unit).  That's our 'pure bench' unit (which has played primarily against opposing benches).   This one shows that Jaylen Brown actually has played pretty well with the bench.   The offense hasn't been super great with that unit, but a lot of that unit's minutes were from earlier in the year.   Several of those guys are scoring the ball a lot better now than earlier in the year.

[The Oracle]

So lets say you do continue to start Brown when Avery comes back.  There are only 96 guard minutes unless you want Brad to go back to using those garbage 3 guard line ups.   

I.T.     34.5  per game average this year
Avery  34.9
Smart  30.7

That's 100.1 minutes between those 3 so whose minutes are you going to take away and give to Brown starting at SG??  That is without any consideration for Rozier at all.  Starting Brown is just not even a remote possibility without trading someone.

[Bostoncelticsforlife7]

Bunch of ingrates 

That aside, Avery is a better player than Jaylen in almost EVERYTHING.  We start the better player, plain and simple.

The best way to screw up this team's chemistry and send us back down a sh!tty path is what you guys are advocating.

Anybody remember Ray Allen/Bradley/Rondo/Doc fiasco?  I could even stomach that one because Ray was injury prone and at the tale end of his career while the young Bradley was starting to come into his own but it messed up the team's chemistry which eventually led to Ray signing with the Lebron. 

Jaylen is a f'ing rookie for godsakes...a rookie with many flaws still, starting in place of someone clearly better and someone with the longest tenure here.  ****H.

That's not true . Brown as a rookie is already stronger, longer, healthier, better slasher, has more upside and more versatile defensively

Stronger?  By what measure?

Longer?  True

Healthier?  He hasn't log as many minutes so I wouldn't say so

Better Slasher?  LOL...ummm...NO

Has more upside?  We'll see in couple years or so

More versatile defensively?  NO

How about we talk things that are tangible and more important to this team such as offense, defense, rebounding, 3 pt percentage, perimeter defense, FT shooting percentage, experience, playoffs experience,...you know, those things Bradley is CLEARLY better at than Jaylen?

Stronger? Yes, he has 40-50lbs on him LOL
Longer? Yes
Healthier? So far, yes
Better slasher? Arguable but I would say yes. Avery mainly drives off of cuts and Jaylen can get to the rim seemingly at will and already is a better finisher
Higher upside? Yes
More versitile defensively? Yes
Seven game win streak? Yes
Bench is inconsistent? Yes
Brown plays better with starters? Yes
Smart and Bradley coming off the bench? Yikes
What else needs to be said

So much fail in this post I don't know where to begin.  And the fact that you completely ignore the last part of my post says a lot.  You didn't put up anything worth arguing so I won't even bother.  Seven game win streak...smh #palmface

You were wrong on almost every single question you answered. And I'm not saying that brown should play more minutes than Bradley. Bradley should get he same amount of minutes coming off the bench and brown should get 10-15 minutes starting. Bradley is no doubt the better player, but when you consider the several factors like our young inconsistent bench, the advance stats that show that Avery and Isaiah aren't a good pairing defensivly, Avery has played his best basketball coming off the bench, Jaylen is playing A LOT better starting, playing better defense and consistently scoring double figures, and Jaylens superstar potential, you have to consider it

To be fair everyone is a bad defensive pairing next to IT.

Here are the 9 5-man units that the Celtics have played at least 50 minutes this year, sorted by defensive rating (points surrendered per 100 possessions):


Unit             min    ORtg   DRtg   NetRtg
TR+MS+JB+JJ+KO   59.2  100.0   94.0   +6.0
IT+AB+JC+JJ+AH   50.0  114.1   97.1  +17.0
IT+AB+MS+AH+KO   74.9   99.4  103.8   -4.5
IT+MS+JC+AH+AJ  118.1  119.6  107.2  +12.4
IT+AB+JC+AH+KO   59.2  127.6  108.3  +19.4
IT+AB+JC+AH+AJ  251.4  115.6  109.8   +5.9
MS+AB+JC+AH+AJ   63.3  120.5  111.6   +8.9
IT+MS+JC+AH+KO   71.8  120.7  120.8   -0.1
IT+AB+MS+JC+AH   63.9  116.3  127.1  -10.8


The team's overall defensive rating is about 109.2.

Thomas is on 7 of those 5-man units.  Five of those seven range from team average to really, really excellent.   This suggests that, no, not everyone is bad defensively pairing next to IT.

It is useful to look at the worst lineup (both by DRtg AND Net) and compare it to the second best lineup (also in both categories).  The difference is simply swapping in Jerebko for Marcus.   That simple change, which has nothing to do with Isaiah, transforms it from a cluster-mess to a really excellent lineup on both ends of the floor.   

The difference between those two also isn't because Marcus is a crap defender and Jerebko is a super-elite one, either.   The difference is the worst lineup has both Marcus and Jae playing 'small' and out of position whereas the swap transforms it to a conventional lineup, with everyone playing their normal position.

For the purposes of this particular thread, it is probably also important to note the top defensive unit (which is the 5th best NetRtg unit).  That's our 'pure bench' unit (which has played primarily against opposing benches).   This one shows that Jaylen Brown actually has played pretty well with the bench.   The offense hasn't been super great with that unit, but a lot of that unit's minutes were from earlier in the year.   Several of those guys are scoring the ball a lot better now than earlier in the year.

What about the IT, Jaylen, Crowder, Johnson, and Horford lineup?

[Celtics4ever]

Bradley is the better player and deserves to start.    But I would keep Brown in the starting lineup because it makes us a better team for the post season.   If Avery could score off the bench and add some serious pop to our bench scoring I think it helps us more than with the starters.

[clevelandceltic]

Bunch of ingrates 

That aside, Avery is a better player than Jaylen in almost EVERYTHING.  We start the better player, plain and simple.

The best way to screw up this team's chemistry and send us back down a sh!tty path is what you guys are advocating.

Anybody remember Ray Allen/Bradley/Rondo/Doc fiasco?  I could even stomach that one because Ray was injury prone and at the tale end of his career while the young Bradley was starting to come into his own but it messed up the team's chemistry which eventually led to Ray signing with the Lebron. 

Jaylen is a f'ing rookie for godsakes...a rookie with many flaws still, starting in place of someone clearly better and someone with the longest tenure here.  ****H.

That's not true . Brown as a rookie is already stronger, longer, healthier, better slasher, has more upside and more versatile defensively

Stronger?  By what measure?

Longer?  True

Healthier?  He hasn't log as many minutes so I wouldn't say so

Better Slasher?  LOL...ummm...NO

Has more upside?  We'll see in couple years or so

More versatile defensively?  NO

How about we talk things that are tangible and more important to this team such as offense, defense, rebounding, 3 pt percentage, perimeter defense, FT shooting percentage, experience, playoffs experience,...you know, those things Bradley is CLEARLY better at than Jaylen?

Stronger? Yes, he has 40-50lbs on him LOL
Longer? Yes
Healthier? So far, yes
Better slasher? Arguable but I would say yes. Avery mainly drives off of cuts and Jaylen can get to the rim seemingly at will and already is a better finisher
Higher upside? Yes
More versitile defensively? Yes
Seven game win streak? Yes
Bench is inconsistent? Yes
Brown plays better with starters? Yes
Smart and Bradley coming off the bench? Yikes
What else needs to be said

So much fail in this post I don't know where to begin.  And the fact that you completely ignore the last part of my post says a lot.  You didn't put up anything worth arguing so I won't even bother.  Seven game win streak...smh #palmface

You were wrong on almost every single question you answered. And I'm not saying that brown should play more minutes than Bradley. Bradley should get he same amount of minutes coming off the bench and brown should get 10-15 minutes starting. Bradley is no doubt the better player, but when you consider the several factors like our young inconsistent bench, the advance stats that show that Avery and Isaiah aren't a good pairing defensivly, Avery has played his best basketball coming off the bench, Jaylen is playing A LOT better starting, playing better defense and consistently scoring double figures, and Jaylens superstar potential, you have to consider it

To be fair everyone is a bad defensive pairing next to IT.

Here are the 9 5-man units that the Celtics have played at least 50 minutes this year, sorted by defensive rating (points surrendered per 100 possessions):


Unit             min    ORtg   DRtg   NetRtg
TR+MS+JB+JJ+KO   59.2  100.0   94.0   +6.0
IT+AB+JC+JJ+AH   50.0  114.1   97.1  +17.0
IT+AB+MS+AH+KO   74.9   99.4  103.8   -4.5
IT+MS+JC+AH+AJ  118.1  119.6  107.2  +12.4
IT+AB+JC+AH+KO   59.2  127.6  108.3  +19.4
IT+AB+JC+AH+AJ  251.4  115.6  109.8   +5.9
MS+AB+JC+AH+AJ   63.3  120.5  111.6   +8.9
IT+MS+JC+AH+KO   71.8  120.7  120.8   -0.1
IT+AB+MS+JC+AH   63.9  116.3  127.1  -10.8


The team's overall defensive rating is about 109.2.

Thomas is on 7 of those 5-man units.  Five of those seven range from team average to really, really excellent.   This suggests that, no, not everyone is bad defensively pairing next to IT.

It is useful to look at the worst lineup (both by DRtg AND Net) and compare it to the second best lineup (also in both categories).  The difference is simply swapping in Jerebko for Marcus.   That simple change, which has nothing to do with Isaiah, transforms it from a cluster-mess to a really excellent lineup on both ends of the floor.   

The difference between those two also isn't because Marcus is a crap defender and Jerebko is a super-elite one, either.   The difference is the worst lineup has both Marcus and Jae playing 'small' and out of position whereas the swap transforms it to a conventional lineup, with everyone playing their normal position.

For the purposes of this particular thread, it is probably also important to note the top defensive unit (which is the 5th best NetRtg unit).  That's our 'pure bench' unit (which has played primarily against opposing benches).   This one shows that Jaylen Brown actually has played pretty well with the bench.   The offense hasn't been super great with that unit, but a lot of that unit's minutes were from earlier in the year.   Several of those guys are scoring the ball a lot better now than earlier in the year.

By pair, I mean two. Both AB and Brown have a negative rating starting next to IT.

[SHAQATTACK]

Bradley is the better player and deserves to start.    But I would keep Brown in the starting lineup because it makes us a better team for the post season.   If Avery could score off the bench and add some serious pop to our bench scoring I think it helps us more than with the starters.

This ^

We gonna need Brown with as much experience and confidence as we can get for post season

[The Oracle]

Bunch of ingrates 

That aside, Avery is a better player than Jaylen in almost EVERYTHING.  We start the better player, plain and simple.

The best way to screw up this team's chemistry and send us back down a sh!tty path is what you guys are advocating.

Anybody remember Ray Allen/Bradley/Rondo/Doc fiasco?  I could even stomach that one because Ray was injury prone and at the tale end of his career while the young Bradley was starting to come into his own but it messed up the team's chemistry which eventually led to Ray signing with the Lebron. 

Jaylen is a f'ing rookie for godsakes...a rookie with many flaws still, starting in place of someone clearly better and someone with the longest tenure here.  ****H.

That's not true . Brown as a rookie is already stronger, longer, healthier, better slasher, has more upside and more versatile defensively

Stronger?  By what measure?

Longer?  True

Healthier?  He hasn't log as many minutes so I wouldn't say so

Better Slasher?  LOL...ummm...NO

Has more upside?  We'll see in couple years or so

More versatile defensively?  NO

How about we talk things that are tangible and more important to this team such as offense, defense, rebounding, 3 pt percentage, perimeter defense, FT shooting percentage, experience, playoffs experience,...you know, those things Bradley is CLEARLY better at than Jaylen?

Stronger? Yes, he has 40-50lbs on him LOL
Longer? Yes
Healthier? So far, yes
Better slasher? Arguable but I would say yes. Avery mainly drives off of cuts and Jaylen can get to the rim seemingly at will and already is a better finisher
Higher upside? Yes
More versitile defensively? Yes
Seven game win streak? Yes
Bench is inconsistent? Yes
Brown plays better with starters? Yes
Smart and Bradley coming off the bench? Yikes
What else needs to be said

So much fail in this post I don't know where to begin.  And the fact that you completely ignore the last part of my post says a lot.  You didn't put up anything worth arguing so I won't even bother.  Seven game win streak...smh #palmface

You were wrong on almost every single question you answered. And I'm not saying that brown should play more minutes than Bradley. Bradley should get he same amount of minutes coming off the bench and brown should get 10-15 minutes starting. Bradley is no doubt the better player, but when you consider the several factors like our young inconsistent bench, the advance stats that show that Avery and Isaiah aren't a good pairing defensivly, Avery has played his best basketball coming off the bench, Jaylen is playing A LOT better starting, playing better defense and consistently scoring double figures, and Jaylens superstar potential, you have to consider it

To be fair everyone is a bad defensive pairing next to IT.

Here are the 9 5-man units that the Celtics have played at least 50 minutes this year, sorted by defensive rating (points surrendered per 100 possessions):


Unit             min    ORtg   DRtg   NetRtg
TR+MS+JB+JJ+KO   59.2  100.0   94.0   +6.0
IT+AB+JC+JJ+AH   50.0  114.1   97.1  +17.0
IT+AB+MS+AH+KO   74.9   99.4  103.8   -4.5
IT+MS+JC+AH+AJ  118.1  119.6  107.2  +12.4
IT+AB+JC+AH+KO   59.2  127.6  108.3  +19.4
IT+AB+JC+AH+AJ  251.4  115.6  109.8   +5.9
MS+AB+JC+AH+AJ   63.3  120.5  111.6   +8.9
IT+MS+JC+AH+KO   71.8  120.7  120.8   -0.1
IT+AB+MS+JC+AH   63.9  116.3  127.1  -10.8


The team's overall defensive rating is about 109.2.

Thomas is on 7 of those 5-man units.  Five of those seven range from team average to really, really excellent.   This suggests that, no, not everyone is bad defensively pairing next to IT.

It is useful to look at the worst lineup (both by DRtg AND Net) and compare it to the second best lineup (also in both categories).  The difference is simply swapping in Jerebko for Marcus.   That simple change, which has nothing to do with Isaiah, transforms it from a cluster-mess to a really excellent lineup on both ends of the floor.   

The difference between those two also isn't because Marcus is a crap defender and Jerebko is a super-elite one, either.   The difference is the worst lineup has both Marcus and Jae playing 'small' and out of position whereas the swap transforms it to a conventional lineup, with everyone playing their normal position.

For the purposes of this particular thread, it is probably also important to note the top defensive unit (which is the 5th best NetRtg unit).  That's our 'pure bench' unit (which has played primarily against opposing benches).   This one shows that Jaylen Brown actually has played pretty well with the bench.   The offense hasn't been super great with that unit, but a lot of that unit's minutes were from earlier in the year.   Several of those guys are scoring the ball a lot better now than earlier in the year.

By pair, I mean two. Both AB and Brown have a negative rating starting next to IT.

Those numbers are all way wonkie anyway in comparison to what NBA.com has.  The minute totals appear to be accurate but not the ratings.  50 and 100 minute samples are next to worthless.

[Greyman]

Bradley. While the team has been doing okay without him, he will be required on both defence and to take attention from IT with his scoring against the best teams.

Brown has a way to go before he displaces AB.

[Granath]

This thread reminds me of the whole "IT should come off the bench" debacle discussion. You can see from my sig that I have high hopes for Brown but Bradley is the guy who pairs best with IT.

[chambers]

Avery is arguably our second most important player, even more important that Al Horford given his impact on both ends. He's our second leading scorer, leading rebounder and is our best/2nd best defender. He also hits the 3 way better than Jaylen at this point.

Jaylen is awesome, and is doing really well, but he's a project, and he's only playing this many minutes while Avery is out, which will help our bench and Jaylen's experience through his first playoffs. Right now just getting Jaylen on the floor and letting him iron out his rookie kinks is priority number one. His D is coming along, his offense is still working itself out and he's learning our plays.

When Avery comes back, he might come off the bench for a game or two but if he's back to full health he will NEVER be put on the bench in favor of Jaylen.

Avery Bradley is simply a much better basketball player on both ends of the floor.

Here's an easy way to look at this..ask yourself:
When we play the Wizards, Raptors or Cavs in a 7 game series who are you putting out there with Isaiah to defend and score against the very best guards in the East?

[straightouttabahstun]

Jaylen should start for now and Avery should come off the bench his first few games back until he's really back into game shape. This has been very good for Brown and I think that when the time comes, he will be closer to an ideal scorer off the bench for the remainder of the season. That should be the goal for this team-get JB to be a weapon off the bench. He's clearly capable of it

[mmmmm]

Bunch of ingrates 

That aside, Avery is a better player than Jaylen in almost EVERYTHING.  We start the better player, plain and simple.

The best way to screw up this team's chemistry and send us back down a sh!tty path is what you guys are advocating.

Anybody remember Ray Allen/Bradley/Rondo/Doc fiasco?  I could even stomach that one because Ray was injury prone and at the tale end of his career while the young Bradley was starting to come into his own but it messed up the team's chemistry which eventually led to Ray signing with the Lebron. 

Jaylen is a f'ing rookie for godsakes...a rookie with many flaws still, starting in place of someone clearly better and someone with the longest tenure here.  ****H.

That's not true . Brown as a rookie is already stronger, longer, healthier, better slasher, has more upside and more versatile defensively

Stronger?  By what measure?

Longer?  True

Healthier?  He hasn't log as many minutes so I wouldn't say so

Better Slasher?  LOL...ummm...NO

Has more upside?  We'll see in couple years or so

More versatile defensively?  NO

How about we talk things that are tangible and more important to this team such as offense, defense, rebounding, 3 pt percentage, perimeter defense, FT shooting percentage, experience, playoffs experience,...you know, those things Bradley is CLEARLY better at than Jaylen?

Stronger? Yes, he has 40-50lbs on him LOL
Longer? Yes
Healthier? So far, yes
Better slasher? Arguable but I would say yes. Avery mainly drives off of cuts and Jaylen can get to the rim seemingly at will and already is a better finisher
Higher upside? Yes
More versitile defensively? Yes
Seven game win streak? Yes
Bench is inconsistent? Yes
Brown plays better with starters? Yes
Smart and Bradley coming off the bench? Yikes
What else needs to be said

So much fail in this post I don't know where to begin.  And the fact that you completely ignore the last part of my post says a lot.  You didn't put up anything worth arguing so I won't even bother.  Seven game win streak...smh #palmface

You were wrong on almost every single question you answered. And I'm not saying that brown should play more minutes than Bradley. Bradley should get he same amount of minutes coming off the bench and brown should get 10-15 minutes starting. Bradley is no doubt the better player, but when you consider the several factors like our young inconsistent bench, the advance stats that show that Avery and Isaiah aren't a good pairing defensivly, Avery has played his best basketball coming off the bench, Jaylen is playing A LOT better starting, playing better defense and consistently scoring double figures, and Jaylens superstar potential, you have to consider it

To be fair everyone is a bad defensive pairing next to IT.

Here are the 9 5-man units that the Celtics have played at least 50 minutes this year, sorted by defensive rating (points surrendered per 100 possessions):


Unit             min    ORtg   DRtg   NetRtg
TR+MS+JB+JJ+KO   59.2  100.0   94.0   +6.0
IT+AB+JC+JJ+AH   50.0  114.1   97.1  +17.0
IT+AB+MS+AH+KO   74.9   99.4  103.8   -4.5
IT+MS+JC+AH+AJ  118.1  119.6  107.2  +12.4
IT+AB+JC+AH+KO   59.2  127.6  108.3  +19.4
IT+AB+JC+AH+AJ  251.4  115.6  109.8   +5.9
MS+AB+JC+AH+AJ   63.3  120.5  111.6   +8.9
IT+MS+JC+AH+KO   71.8  120.7  120.8   -0.1
IT+AB+MS+JC+AH   63.9  116.3  127.1  -10.8


The team's overall defensive rating is about 109.2.

Thomas is on 7 of those 5-man units.  Five of those seven range from team average to really, really excellent.   This suggests that, no, not everyone is bad defensively pairing next to IT.

It is useful to look at the worst lineup (both by DRtg AND Net) and compare it to the second best lineup (also in both categories).  The difference is simply swapping in Jerebko for Marcus.   That simple change, which has nothing to do with Isaiah, transforms it from a cluster-mess to a really excellent lineup on both ends of the floor.   

The difference between those two also isn't because Marcus is a crap defender and Jerebko is a super-elite one, either.   The difference is the worst lineup has both Marcus and Jae playing 'small' and out of position whereas the swap transforms it to a conventional lineup, with everyone playing their normal position.

For the purposes of this particular thread, it is probably also important to note the top defensive unit (which is the 5th best NetRtg unit).  That's our 'pure bench' unit (which has played primarily against opposing benches).   This one shows that Jaylen Brown actually has played pretty well with the bench.   The offense hasn't been super great with that unit, but a lot of that unit's minutes were from earlier in the year.   Several of those guys are scoring the ball a lot better now than earlier in the year.

What about the IT, Jaylen, Crowder, Johnson, and Horford lineup?

That lineup only has a tiny 33.4 minutes played so far.  Their NetRtg is -4.7.  It's defense has been good (95.5), but it's offense has been pretty awful.  But it is a super-tiny sample.