Boston Celtics
Assuming Jaylen wants his own team, Boston threads the needle as well as they can getting assets and valuable rotation players. Not sure they need to go all in on another star just yet. Tatum is young and Mazzulla has shown some really decent developmental skills. Not a knock at JB but I could see addition by subtraction.
Miami Heat
Miami re-creates their winning formula, swapping with Jaylen Brown as the new Jimmy Butler, and Herro and Bam back into their winning roles. They give up their two flashiest young guys, but they keep the bulk of them.