He hit that game winner against Utah two years ago, with Hayward on the opposing side.
Hayward never forgot about that LOL.
Smart move Ainge! Making us more attractive and increasing our chances!
That being said, I do hope the best for Amir and Zeller going forward. Even when they didn't get minutes and though they weren't elite players, they were great veterans who acted professionally and were a part of the team's growth the last 2-3 seasons. I wish them the best of luck going forward!

(Although I have heard some rumblings that a Zeller-Celtics reunion is not out of the question if he's willing to come back via an exception or something).