His character is in question until proven otherwise. We'll see...
Well, Danny went to bat for Williams' character a bit in his introductory press conference. When questions about his motor came up, Ainge interjected that it was hard to win the defensive play of the year in a tough conference with a poor motor.
IF you peruse the Texas AM forums (some of the more avid fans who tend to be on campus and know the situations of the teams), they don't say a single bad thing about him.
In fact, they loved him. They say things like "It's hard to develop your game in a do-it-yourself program." In other words, they saw Williams working hard on his game, but they didn't think the coaching staff helped him along.