The problem is that when players like Thompson or even Brockman are off, they still matter. On the defensive boards. On loose balls. On defense. On the offensive glass. It's just not the case right now with Hawes, and that's both a huge personal/personnel disappointment and also a gaping hole on the court. Przybilla is mostly an offensive zero (except on the glass). But he plays great defense, and boards like a beast. When Hawes is an offensive zero, he needs to be a wall to justify playing time.