Danny Ainge has to do what he feels is right for the Celtics no matter what.
But most NBA followers will agree with Kevin Prichard (Indiana GM) that Danny Ainge had unrealistic demands and squashed a fine deal for all involved parties by being too greedy.
Biggest perceived weakness on your Conference Finals team is the center position and then you get the chance to get a young starting center on a multi-year-contract back in a deal for a player you'll lose otherwise to another franchise anyway.
Maybe Ainge is the smartest guy in the room in the end, but right now he looks like an idiot to many NBA fans and I think some GM's and agents also are a bit perplexed.