If Williams ever becomes a rotation player in the NBA, that will be a major success based on his draft position. We give guys like RJ Hunter, JaJuan Johnson, Fab Melo, and JR Giddens a pass because they were drafted late in the 20s.
I understand he went much later than anticipated, but that just magnifies his possible 'issues.' Williams may have a very bright future, but that would be more of a welcome surprise than an expected outcome. As Cs fans, I think we are all still riding really high from Tatum and Brown and, to a lesser extent, Rozier, Smart, and KO.
People were similarly hard on Sullinger, but he was actually a starter on a playoff team; that is pretty impressive.
As for the question, I expect Williams to spend a lot of time in Maine, but hope that he proves himself worthy of playing in Boston most of the year.