“[The IT / Kyrie trade] changes the whole dynamic, the whole culture. We’ll see if it’s for good or bad, time will tell. But it’s still a little weird to me, to be honest, because when I came in everything they stressed was culture, environment, Celtic basketball. Now, it’s like what is the environment, the culture, what is Celtic basketball? I think it’s a great opportunity for me, great opportunity for the Celtics, great opportunity for Kyrie. Obviously, I loved Isaiah. He was like a big brother to me. I watched him, admired him, the chip he carried on his shoulder I love him. I still do. I’ve kept in contact with him. Congratulated him when he got traded to the Cavs. It’s tough because it’s the business we live in. Do I agree with it? Not necessarily. I think Isaiah definitely tried to plant his flag in Boston. He will definitely be missed—he and Jae [Crowder] both.
https://www.yahoo.com/sports/celtics-jaylen-brown-says-trading-232006797.html
I am really surprised less has been made about the Avery Bradley trade, I know it has been overshadowed by the Thomas/Kyrie trade but still if you want to talk about a culture loss you can't go past AB. He was the link to the Big Three era and was so good as a kid he forced Ray to the bench. AB worked is ass off both sides of the floor and was the most respected perimeter defender in the league. If Bradley wasn't next to Thomas I am sure that we would have been the worst defensive team in the league by some margin, AB was the definition of the perfect culture guy, I still have feint hope that we can somehow bring him back next season after acquiring Davis 
Agree 100%. AB was my favorite player last year and probably the year before too. Great player, great attitude, hard to see the last big 3 era player gone. He improved so much over the years.
Agree as well. Honestly, I feel like AB impacted team culture more than anybody else.
He may not have been much of a talker, but he bailed the team out so many times with his energy, and he did it on both ends of the court depending on where he was needed.
Bradley was obviously most known for his defence, but he had a highly underrated ability to explode on offense. When he got hot, there would be stretches where he would be the most unstoppable scorer in the building. I would see glimpses of vintage Ray Allen in him at times; the way he'd curl around screens, catch, elevate and shoot so quickly. Hand in his face - didn't matter. When he gets the hot hand he CANNOT miss, and was essentially un-defendable...and there were so many times where he bailed Boston out single-handedly with 10-12 point scoring streaks.
And it didn't matter if he was out there providing a spark on the offensive end of the defensive end, Bradley often impacted the game in huge ways over short stretches - and he tended to do it in ways that energized the crowd and everybody else on the court, and his energy always seemed to rub off on his teammates.
Will miss that kid immensely and wish him the greatest individual success in Detroit. Even if he's not a Celtic anymore, there is nothing I'd love more then to see Bradley one day make an All Star team.