I don't see how we don't have a consistent 8 player rotation next year.
Guards--BT, MCW, Cooney
Forwards--Rak, CJ, James
Centers--Coleman, Baye
The 9th guy is a highly recruited forward [Grant] who will probably play MCW-type minutes next year behind a trio of experienced forwards. He'll get his feet wet and be ready to play a more prominent role starting when he's a sophomore.
If a couple of things fall into place [i.e., Rak / MCW making the sophomore "jump," CJ and BT emerging as consistent double figure scorers, etc.], next year's team could be loaded. Lots of depth, solid shooting, flexibility with guys capable of playing multiple positions, and tons of size.
Good chance for Grant to get a lot more than MCW minutes. Playing the 4th guard behind 3 real good combo-guards, as MCW did, is not going to lead to minutes.
CJ is going to play big minutes, but the other two guys ahead of Grant at forward aren't all-purpose forwards. Rak showed better at C than at F and still has to develop a shot and the ability to put the ball on the floor. Southerland is streaky -- getting better at ball-handling, but still a work in progress. Grant might fill a need.
As to the larger point (how deep will we go?), I agree we have depth. The question will be whether MCW and DC2 are ready to step up big, as Dion & Fab did this year. It is a lot to ask.