Ainge should have traded Kyrie after his first couple of media sessions when he was in Boston. You could clearly see he was a nut job. A guy who talks like that, no matter how great a talent he is, and for Kyrie he's not much of a talent because is total lack of effort on D combined with his ball hogging offensive arrogance is ultimately a net negative, can never be a guy leading your team or be a guy who is part of the leadership of your team - just cannot happen, whether you think Durant of AD might come because of it. It won't work - ever.
It was a colossal error of judgment on Ainge's part, or Ainge and ownership. You could have gotten a lot from, probably from Brooklyn, had you traded him when you should have. The team that year actually played better with Rozier at the point. Probably because while Rozier definitely has some loose cannon attributes about him, he's not a total arse like Kyrie.