I can't see just dumping Sully before we see what his conditioning has done to his game.
Don't forget Lee is gone next year, he's 32 and looking forward to free agency. If we trade Sully, and he turns into a 17 and 10 guy, and yes a conditioned Sully with his head on straight could do it, we shot ourselves in the foot. Now matter what you think of him, he's young and has more upside.
The problem is both Lee and Sully will be looking for big minutes this year, because they're both free agents.
We have 3 other PF's looking for minutes. I would like to see Mickey get a good look, plus KO needs minutes, plus JJ is another.
Honestly, Lee is a guy that may get us another playoff appearance, he scores well, but long term, why did we get this guy again?