"The Celtics big men are not great defenders", that is a true statement but that was not the only problem last night. Toronto was running the high Pick and Roll with their bigs and we did not have enough overall talent to defend it.
If we sagged off their perimeter players to help in the box, they killed us with 3s. When those players stayed home, we had no one to cover for our big who was out on the perimeter "showing" on the dribbler.
Toronto is a good team. There is probably some scheme or execution refinements that we can make but the problem was not all on the bigs. Simply having Larry Sanders or whoever is not going to suddenly make us able to defend. It would help, but the problem in the 4th period last night was more nuanced than that.