Bottom line is that there's a multitude of factors that contribute to those "on court/off court" stats.
The #1 factor being Okafor was on the court.
It doesn't really come down to them making more shots with Okafor sitting. If anything, it's defense-related.
The 7.5 point differential is offense only. Philly was also markedly worse defensively with Okafor on the court but I'm not even bothering to factor that in.
Obviously the anti-okafors will jump for glee at that comment, but I think it's less about Okafor and more about Nerlens NOel. Noel has proven to be an exceptional defensive player. He has by far the highest defensive rating on the team and clearly plays far better when he's anchoring the defense from the center position. His stats at center vs power forward last season were night and day. Any hope at success Philly had last season revolved around Noel's defense creating offense - and any lineup featuring Okafor pushed Noel out of the picture for the most part.
So it shouldn't be a total surprise that a team of young athletic players would feed off Noel's defense. It's not like they flourished - they still sucked... but obviously philly didn't have the right talent to put around Okafor and any lineup featuring him was going to struggle compared to a lineup built around Noel's defense.
If your argument is that Okafor was so bad on defense that he dragged down the offense, I don't think that's helping your cause any.
That said, Okafor is young and can improve on the defensive end.
Couldn't get much worse, that's for sure. But he may never get better.
And anyone who has watched him play can see he's a versatile and potentially dominant offensive threat that you can succeed with if you have the right surrounding talent.
I wouldn't call him versatile. It's not like you can stick him out at 3 point land. He's an interior PF/C who does have some nice scoring touch. He's also currently a space-hogging, ball-hogging, old-fashioned PF/C who is a mediocre rebounder and who doesn't really generate offense for the other players on the court.
Boston has some decent guards. Having Okafor down low could potentially open things up for them. There's a chance Okafor would flourish here. When you consider that some of our options with the #3 pick might result in role player talent, it's easy to get excited about the possibility of trading the pick for a legit prospect like Okafor.
There is a chance that Okafor would flourish here. There's also a chance that he's not going to get significantly better.
Look, Philly was truly awful last year. Okafor gets somewhat of a pass for that. But it's hard to look at him and his stats and then compare those with someone like Noel. Despite how terrible Philly was, Noel's advanced statistics aren't awful - especially when you consider that they played a lot together (in fact, it was Philly's most common lineup). Which means when you look at lineups for Philly, Noel + Okafor was a disaster. Okafor without Noel was a disaster. But Noel without Okafor was actually reasonably (at least for that team) successful.
I'm not entirely anti-Okafor. But the excuses that some of you concoct to try to excuse his play last year are pretty absurd. Not only does ANYONE in Philly need a different environment to try to thrive, Okafor needs some serious coaching, a conditioning expert and a good swift kick in the ass so he pounds the boards better, he actually tries on defense and he's not a black hole on offense. Now if Danny & Co. believe that they can do that, then I'm all for it. But don't act like Okafor's not a major project - there's a lot of work to be done for him to be a true pro and a lot of that work is between his ears. That kind of work scares me a bit because there's only so much someone else can do in that case. If he's not motivated to play defense or hit the boards, he'll find his role in the NBA is just being a scoring punch off the bench.
By the way, that "swift kick" is one of the reasons I think trading Smart would be a mistake if you bring in someone like Okafor. Smart's offensive game last year was awful but let's face it his defensive effort was infectious. The team responded to his lockdown defense and that's why all of his advanced metrics are much, much better than just his ppg stats. He has the ability to lead and putting Smart, Bradley and Jae on the wings would go a long way in hiding Okafor's defensive issues until such time he gets better. That fit is too natural to trade Smart in a package to get Okafor.