In his current condition, Sully is a good short minute option off the bench on a good team.
When he has his legs, he's effective. He rebounds well, and scores in a multitude of ways, he's a good passer too. Unfortunately as minutes go by, his effectiveness suffers. He begins taking plays off, not making it back on D, his shot flattens out, mostly hitting the front rim. His greatest value, is his greatest hinderance...his bulk. He can't defend his own natural position PF, he's best used to be a road block against taller, longer centers.
Sully is not a starter on any team. Sully either signs a team friendly contract, or we should allow him to walk.