I'm going to assume that the only reason why he hasn't gotten his surgery yet is because he wants to be on the bench in support. Thats the only thing I can think of.
I honestly don't see how his injury was THAT bad that he can't play at all this post season. It still puzzles me.
Why does anyone still ask about this? I don't see what is confusing.
If he gets the surgery, that is definitely it for the season. If he wait, even if the chances are exceedingly small, there's always the possibility that he could eventually suit up.
According to past comments from Celtics people, the surgery will not involve fixing his main problem. It will just be cleaning, and it has been said multiple time that the surgery will not fix his problem. Rest is what will fix his problem. Hopefully one more week of rest will do the trick

You don't see how his injury was that bad? Can you tell us what the injury was? I assume you know what it is if it doesn't seem that bad to you.