What I've seen is
Scal on Dirk=dirk scores easily, has no problems,
Baby on Dirk=dirk scores easily, has no problems
Sheed on Dirk=dirk scores, has more difficulty, has turned the ball over
I think its obvious we could use a long, athletic tall player (ala Dominic McGuire, Sean Williams) who has a defensive mindset. It wont hurt to put a guy like that on the roster, because thats how most 4's and 5's are in the league now, anyways.