Williams should be playing more. That being said, KO put him in the game and left him in the game. That's all you can really ask considering the fact that we're talking about a guy who had been very limited coming into this game.
Playing well in a pinch when you're down 20 is one thing. Sustaining it over the course of several games is quite another. There have been times this season when the board has bashed Ollie for not playing Williams, Polley, Whaley, and Diarra enough, and while I agree that the minute management has been less than ideal, at some point you have to accept the fact that none of these players are good. You can start Williams next game if you want, but chances are we're going to get blown out again and then someone else will have the pleasure of playing with the Michael Jordan of garbage time to up their numbers.