If AB is out till Dec, he's going to a bit behind, and will probably take an other month to get back to were he was before.
I think its going to come down to who complements each other on the floor.
AB better defender. Lee better shooter.
Rondo poorer shooter, so you complement him with Lee.
Terry a great shooter, you complement him with Bradley, who will handle the rock more and get people in their places. I think a Terry/AB bench is a heck of a spark that any team needs.
Usally you have your "everything" guys start, and your "specialty" guys come off the bench. Terry is scoring, and AB is the D. AB isn't quite there in having an all around game, he's close, but Lee is there right now.