The discussion centered around how much practice time Marvin was really putting in and that is why he was on the bench.
Reality is, when the coach is going with an 8 man rotation and tells Marvin, he's not in the rotation, that's a hard place to climb out of. 8 man rotation is going to leave some very capable players on the bench for any NBA team.
This is something I've disagreed with in Basketball coaching for a long-time - the 7 or 8 man rotation - there are several benefits to extending the bench....to at least 10 if not more. one main way a player is to improve is to play someone better than himself anyway. Maybe its early in the season; at least Walton looks to be playing 10. Still, I'd like to see Bagley in to see whats what. If he's awful, tug the leash.