For Milwaukee:- You trade Giannis, Portis, Kuzma & Turner and you get back Warriors 26, 28, 30, 32 unprotected pick & 27, 31 swap and also you get 26 pick from Boston & 28 Bos/Sas pick. That's 8 first round pick along with Kuminga & Podziemki as young core. Jimmy here to match the contract.

Now in offseason you get rid of Simmons & Kelly contract (basically getting rid of Portis, Kuzma & Turner huge contract), now you rebuild this year and you get top 5 pick lets say you draft Cam Buzzer or Jalen Wilson with your pick and now your salary cap is 138M from 180M what it supposed to be and in Free agency you can throw 20M ish to Peyton Watson or Shaden Sharpe (no way Denver or Portland can match it)

Now you have G: Ryan Rollins G: Brandin Podziemki F: Jonathan Kuminga F: Peyton Watson C: Cam Buzzer

Also have young player like AJ Green, Warriors 26 pick (15-20th) & Boston 26 pick (24-26th)

Now that's a solid young core with Cam Buzzer being your franchise star while Kuminga, Rollins & Watson can be your 2nd or 3rd best player. With all Warriors 30 31 32 (probably most valuable pick in the league) you can trade for start or with your huge cap space you can sign stars in 27 free agency. This is one scenario I see Bucks & Giannis gets better (ik Spurs or Hawks have better package but even with Giannis Hawks not wining and Bucks will not just throw Giannis in mud and for Spurs i don't think they will include Castle and or Harper in trade if they do that's best package) next year Jimmy contract is expiring so you can trade him somewhere and can get additional draft compensations (expiring deals are more valuable in league)

For Boston you get starting center who can space the floor, while losing your 26 pick (late pick) and expiring Simmons

For Spurs (if they don't go for Giannis) you are just upgrading from Kelly to Portis who fits Spurs system and can be valuable piece to compete (also you lose 28 Bos/Spurs pick either way it's late pick doesn't affect much)

For Warriors you get Giannis what else you need ik you traded all picks till 32 but it's Giannis him & Steph can win it all after Steph is done just build team around Giannis.