Rondo's defensive ratings are interesting because so much of his time was spent on the floor with KG, who was the engine behind those brutal Thibs-style Celtics defenses.
It doesn't surprise me that Rondo posted his worst defensive rating in the last year of the Garnett/Doc era, when KG was a step slower and teams had had yet another year to figure out their defensive schemes.
Defensive rating definitely does depend on the team around you. It can be helped and it can be dragged down.
Here is an interesting one that I dug up a few weeks ago, though when talking about how strong we can expect the backcourt defense to be next season:
Rondo and Bradley have played together on the floor for 701 minutes the last two seasons.
The team DRtg with both on the floor has been about 94. Pretty awesome, right?
About 430 or so of those minutes were with KG as well. The DRtg with all three was 96. Still awesome, of course.
In the ~270 or so minutes that Rondo & Bradley have played
without KG, the team DRtg was just under 90.
This last year, especially in the first 2 months of the season, the entire _team_ played poor team defense, especially with all the new guys on the floor. Rondo was on the floor more than anyone else, with both good AND bad players, so his DRtg was dragged down.
But if you look at his DRtg in 5-man units that were mainly with the holdovers - more experienced in Doc's defense - Rondo's DRtgs were fantastic.
http://www.82games.com/1213/12BOS1.HTM#5manIf you look at the 5-man units that Rondo played the most minutes in, all but 2 of the top 7 have DRtgs of 99 or lower, and one of the other 2 is 101. Only ONE of those units is 'bad' at 115 and that was the unit we played very early in the season with Lee at SG. Just 78 minutes of that 'bad' unit dragged down the otherwise superb defense played in hundreds and hundreds of minutes in other configurations.
Courtney Lee consistently had problems making defensive rotations last season and that is why he eventually got benched.
It is very telling that swapping JET in for Lee fixed a ton of defensive problems because, while JET was a smaller, slower player, he was much more experienced and savvy and didn't make stupid mistakes on rotations.
I really hope Lee plays better team defense this year. I still think he is a good player with a lot of potential we didn't see last year. Stevens' system is very similar to Doc's so that should help.