4 for 1 trades are problematic in season. Cleveland, for instance, would need to eat over $7 million in salary by cutting current players to make things work for Thompson. Only one team has any type of cap space to absorb salary, that being Atlanta and even then I think they only have a couple million. I guess you can find a team with a trade exception to fit into to move salary, but that's now costing either Cleveland or Boston draft capital.
Also, giving up Langford for an minor upgrade at starting center that also costs you your backup center who has recently been averaging a double double off the bench is poor roster and asset management. Ainge would never make such a trade.
As Chris Forsberg was saying on the NBCSB before the game, an upgrade will come in the buyout market and not the trade market, if one happens this year at all. My hope is Favors gets bought out and then signed. After some time to learn the system and adjust, he could slip right into the starting lineup.
Thing is, I am not sure Favors is going to be any better trying to shut down Embiid, Giannis, AD or other MVP caliber big people. Some guys are MVP caliber big people because no one can truly slow them down. You just do your best to let limit them if you can and shut everyone else down. That's how you beat those teams