In this scenario Milwaukee would be basically getting 5 picks, Reaves and Hachimura, since everyone else is an expiring contract, this would give them cap flexibility.

Jimmy is not an expiring but he has a PO that would most likely decline, Bucks could move him somewhere else to get more assets.

Idk if Butler and 3 miami firsts is enough for Giannis, I doubt it, but salaries matched perfectly and if Giannis comes, Jimmy would have to leave since Jimmy, Giannis and Bam would be an awful fit. I did not include Tyler or Duncan bc Miami will need shooters around both Giannis and Bam, and would make also matching their salaries would make this trade even messier.

Lakers get Dame who I think is a good fit giving them much needed spacing. Yeah, they give away their future but if they want to give another championship to Lebron, they dont have many alternatives.

GSW get a much needed rim defender who can shoot from 3.

Miami starting 5 would be: Terry, Herro, Giannis, Jovic, Bam. I think these are the three best players since they can all shoot from 3