I think you ask for the moon and then negotiate your way down from there.
Start by asking for 6 first round picks, 3 pick swaps, Obi, Barrett, Grimes and Quickley.
When the dust settles, they end up keeping Barrett and Quickley, but they give you 5 first round picks, two pick swaps, two second round picks, Toppin, Reddish, Grimes, and rights to Jokubaitis.
And they feel like they ended up winning the trade because they kept 2/4 players you initially asked for and they get their star player who WANTS to be there.