Williams quickness should bother 4s, don't you think? My question with him at 4 has more to do with strength. I'd like to see him against a powerful 4, say Zach Randolph, and see how he would do. I don't know whether Randolph would abuse him in the post or not. (I'll go out on the limb and say that with our current roster, Randolph wouldn't abuse him anymore than anybody else we have on this roster). It's an open question for me; I just haven't seen enough of Williams to make a judgement on that. As far as taking shots away from Cousins, I guess I'm somewhat skeptical on that point. Good teams have a lot of guys that can score. And good teams are unselfish enough to get the ball to the guy that should get the ball. Yes, if DeRozan is truly a selfish player, then absolutely it would not work because by definition he would want to be the #1 guy. If, on the other hand, he really does want to win, and is willing to sacrifice his shooting attempts in order to win, then it might work.
One more thing. You (and others) seem to be saying that you can't pair athletic guys with Cousins because they will leave him in the dust on the offensive end from the fast break basketball they are good at. I don't subscribe to that point of view. I've seen Laker teams with Kareem Abduhl Jabbar on them that were fantastic fast breaking teams. If those teams can run and win championships, the Kings could do the same.