I do have a problem with Doc Rivers. Why is he giving Scalabrine so many minutes and sitting Bill Walker??? that it still something i just can't understand.
Without being too harsh, you must not understand basketball very well, or at least this Celtics team. I am not a huge Scal fan per se, but I can understand why he is Doc's choice at this point for the role/minutes he gives him. Scal is the ultimate fit guy. Yes, he may go a game without a tangible stat which drives people nuts on this board, but he is a reliable decision maker on the floor who knows his role and limitations and what is being asked of him.
He plays hard D, makes the proper rotations, always moves the ball on offense (sometimes even too much passing up open shots), and plays within himself. The young players have much more ability, but would not be able to play without doing something for themselves, their ability is waiting to burst out. Coaches want fit guys on the floor surrounded by talent. Guys who won't do too much, but simply exist to keep the engine running. In many ways, asking Walker, or Giddens to do that simply isn't fair, they have far more talent to give, but the situations just aren't there for them to give it with the others on the floor.
Scal will run the sets, set picks, minimize turnovers, in essence, not do anything to overtly hurt the team. It is precisely because he is so limited in his ability, that he is good at this. He doesn't do too much, because he knows he can't do it. The young guys I am afraid, if asked to do this, would end up standing around, not knowing exactly what do, looking lost. Or worse, they would force something that just isn't there. If the Celts were a 40-45 win team, it might be worth having those guys play minutes, mess up and learn. But in the quest to win 60+ and a title, better to have the seamless cog who is reliably vanilla to fit in with the more talented bunch.