I just realized, but why not Milwaukee?
According to Woj, he doesn't want to be the alpha of a team that has to deal with a ton of pressure all around (media, in-game, etc.)
Well, he could get that with MIL, and a duo of Leonard/Giannis is a problem for a lot of folks (including the C's though the C's are deeper).
Couldn't something like Middleton + Brogdon/Maker + 2018 Bucks 1st + Future 1st get it done?
Even if he's a rental, MIL might be a bit desperate to add legitimate star-power to their team.