I would do a trade Lillard Brown because he gives us what we clearly lacked last year finals and still in close games in this years playoff : a very strong finisher, ballhandler, the 2nd most insane shooter of the league. Baring injury risks he has at least 3 élite years in his legs. I don't see him aging differently than Curry... Tatum isn't a Point Wing we can't ask much more than the progress he did it s like asking Durant 10 years ago the same. Brown is turnover prone, Porzingis not a great collectiv player.
A long term Brown would probably beat all what the Heat can give, Portland may accelerate his rebuild with a very athletic young promising core of guards ans wings with a clear leader. We could give Horford to mentor the project and take Murray for 1 long term potential option at the 4. I would still exigate 1 future first or 2 swaps to compensate the age différence.
Problem is Brown won't sign long term there si the deal isn't réalistic and we have no other way to bring gim