To answer your question, there is a logjam at Sully's position, especially with Stevens trying to showcase Jeff Green at the four.
Yep, that's what it is, you convinced me. We're benching our all-star because we have a "logjam". In fact, we don't -- we have 4 rotational bigs (most teams will consider this merely adequate depth), and Green has barely played any 4 this season (to be precise, he's been at the 4 for about 30 of his 315+ minutes).
Using per 36 for a guy playing 30 minutes is much different than using it for a guy playing 14.
No, not really. Until you play 36 minutes a game you haven't played 36 minutes a game, so either is pretty much a crap shoot.
But the point remains that the fact that a player can't sustain or command 36 minutes of floor time is a should absolutely be held against a player when evaluating their production.