Ainge put 5 rookies on this team (not counting the 2 way players), only 1 of which should be getting minutes. He didn't fill a roster spot and then with Hayward going down that created another open roster spot which he still hasn't filled. So the team has essentially 9 players that should be getting NBA minutes (and I'm using should loosely when it includes players like Larkin), without Irving that is down to 8. Ainge created this situation by putting together a cheap young bench that has no business playing real NBA minutes. I'm guessing Ainge didn't believe the team was a real contender, which would explain this roster construction, but once the team started winning, and winning a lot, Ainge should have at least filled the 2 open spots with actual NBA players.