Just as important and with as much room for improvement as the Celtics starters, are the bench players. The bench could end up being the deciding factor in the Celtics season. If they can play well and carry the team for periods of time while giving the aging core valuable rest, then the Celtics can go far.
However, if they are ineffective, can't hold leads and can only offer minimal rest, then obviously the Celtics will have problems. So far, the bench has performed well, but there is still much room for improvement in a group that has great potential.
(Note: Players not in the rotation such as Greg Stiemsma, Sasha Pavlovic, Marquis Daniels and E'Twaun Moore will not be included)