Just be thankful that he has been a good teammate and hasn't caused a disruption to the team when his role and playing time on this team diminished the way they did. I would say the great majority of players in the league would've been a quite negative presence in the locker room.
Scal's talent is that of a 10th - 15th man. Players like that shouldn't expect to get consistent playing time, so I don't think Scal deserves a great deal of credit for not causing a stir in the locker room. If he was contributing positively on a consistent basis, maybe. However, he just hasn't been very productive in Boston during his stint here, both offensively and on the boards. He plays good defense against some power forwards, but that's about it.
I don't mind Scal, and he seems like a good teammate, but I don't think he in any way deserves kudos for accepting his role, when he clearly is less talented than every player on the team that is getting time ahead of him.
As for Scal's presence on the bench, I have no idea. I know he, Pruitt, and Pollard were the inactive guys on our roster, but I'm not sure why he was or wasn't in street clothes near the bench.