I agree with Nick, things are going so well right now, I wouldn't mess with it. And whether Doc decides to play Gabe over TA when TA comes back, I don't think it'll be based on being afraid to take minutes from TA.
As for Pruitt, I still don't have an opinion. Looks to me like he could be an adequate bench player for a long time, but doesn't really stand out in any way. Maybe that's a good thing- at least he's not making obvious mistakes, and he does appear to have a nice shot. At this point, I'd stick with Gabe, reduce TA's minutes, and PLEASE, forget about Cassell.