Rondo leads the playoffs in minutes per game right now. I think Doc is sending a clear message that we cannot possibly win without him on the floor. I mentioned in the game thread last night that it is not about Rondo being "aggressive" or looking for his shot more, but as the leader, the PG, and the most played player, he has a better feel for everyone's game, probably better than Doc's in some regards.
To that end, he has to feel when Pierce is not getting it done, when Bass is not getting it done, and he has to find other options. If that includes him taking more shots, fine. But he can't keep feeding guys who are not scoring for us.