I've seen a lot of posts calling for Jaylen Brown to be traded. I'm sorry to disappoint everyone but there is 0% chance that is happening. The reason is a bit nerdy, but here it is:
Contract reasons. Jaylen Brown makes roughly 30 million a year, extensions for NBA veterans are limited by the CBA. In Browns case he'll be limited to 140% of his salary. Now, that SHOULD be just enough to get him to his 30% max contract. The issue is that any extension needs to carry over incentives, and Browns contract is full of incentives for games played, all star, team succes, ect. That means any extension he signs will not really be a max, it will have a bunch of non-guaranteed incentives. If Brown waits until 2024 he can instead sign a fully guaranteed max. He's not signing any extension.
But even besides that, Brown would have zero reason to sign an extension with any team he's traded to even if he COULD get a full max extension. If he's traded he is no longer eligible for the Super Max contract. The difference between what a team he's traded to can offer him over four years, vs what any other team can offer him over four years, is relatively minor. The team with his bird rights can offer him 4/192, any other team can offer him 4/184. The team he's traded to can offer him an extra year, but the money over the first 4 years is only 8 million different. There's very little reason to attach himself to whatever team would acquire him when he could wait a year and pick his own team.
So, Jaylen is basically not going to extend to any he's traded too, which craters his market. Nobody is giving up fair value for a guy that is a huge flight risk after one season.
This is why Brown needed to make All-NBA. Because otherwise the c's would have no way to extend him. Making all-nba allows them to offer him between 30% and 35% of the cap, without having to follow normal extension rules. None of those pesky non guarantees, and a lot more money. There's essentially no reason for Brown not to sign the supermax, he isn't getting more money waiting and would in fact be leaving about 40 million on the table (224 through first 4 years, 184 signing with another team) if he decided he wanted to leave. But again, to be clear, this only applies to the Celtics. If he's trade, no supermax. No other team can offer it.
What's going to happen is this: The c's will offer him the super max. He will sign it. When he does he can't be traded for a year. The c's will make some changes around Tatum/Brown next year and see how it goes. If things look terrible next year they can then trade Brown and get back closer to fair value for a guy under contract, if that's the direction they decide to go.
Keep in mind: All of this is completely separate from whether you even think, from a basketball standpoint, they should trade him. I'm not convinced of that. One rough shooting series from Tatum last year didn't move me, one rough shooting series form Brown this year doesn't either. But regardless of your basketball opinion, from a purely value standpoint they really can't.