I'm interested to see how Sullinger reacts if he continues to get his ass handed to him while he's out of shape.
He's had his conditioning criticized many many times before, and he's had a very even-keeled reaction that boiled down to: "people always tell me I'm not athletic enough, but I always get the job done." I remember seeing this come up in interviews before the draft in particular. Sullinger is strong minded in the sense that he thinks he is good at basketball, and anyone who says he's not athletic enough is wrong.
So what will he do if, for the first time, he is wrong in his self-assuredness? Will he turn into a conditioning freak, or will he get depressed and wash out?
Glen Davis keeps getting brought up, but for what it's worth he actually reacted to the same situation by getting himself into some serious fighting shape. The problem in Davis' case was that he genuinely wasn't that good a player. Sullinger's superior passing, his footwork, his soft touch, and his rebounding skill are what really undermine all the Glen Davis comparisons.
If Sullinger works as hard on his conditioning as Glen Davis does, I think he will be an excellent, Boozer-esque player.