Jaylen Brown to any of the 3 Texas teams makes sense for all 3 of them and they all have assets potentially available to trade (though I don't think Dallas is moving Flagg). But Boston has to reach the conclusion that the run is over with this core and rebuild for that sort of trade to happen.
Brown for Johnson, Vassell, 2, 14
Trade seems like a solid trade for both teams.
Boston gets 2 solid youngish wings, a stud at 2, and a mid 1st to supplement team. Move Jrue and KP to get out of aprons (and maybe tax), let Tatum sit all year, and tank for a high lottery pick.
San Antonio is nasty with Fox, Castle, Brown, Sochan, Wemby - Barnes, Champagnie, Branham, Wesley