Only other player in the post season with 15+PPG, 9+RPG, and 6+APG is Lebron.
I wasn't thrilled with Al's rebounding this season but was thrilled with all the other parts of his game(some will say he needs to score more but he is a third offensive option on this team so I never had a problem with his scoring). I think his quiet leadership skills and elite passing ability helped to show me he was worth the max.
Now with his post season, I am sure he is worth the max. Also, if he lures another max level talent to the Celtics, he will have been money well spent.