I don't actually agree with this. Yes TL has some injury issues, yes Horford is old... BUT you have to be assuming that Ime would play the 3rd big a lot instead of just going to more 1 big or semi-big. Given the team's depth at 1-4 (Tatum, Brown, Smart, Brogdon, White, Williams, Gallo) you're now talkign about fighting for 10th man when the team is healthy, and having to convince Ime it's better to have you out there than Gallo or Williams, when 1 big is out. The Celtics are a very deep team. Look at someone like the Lakers. They MIGHT go with AD at C and Bron at PF... if they do the 3rd big is competing with Damian Jones for backup minutes at both positions... where one guys is old and has had injuries recently, and the other is as oft injured at TL. AND AD doesn't really like playing C, so there is a chance that everyone slides down (especially is LeBron is out) and you get to start at C. Last year the "3rd big" role for the Lakers started 46 times... Freedom and Theis combined for 7.
The Celtics' selling point is.. some minutes and a real chance at a ring.