Draft pick - moving up

[Stifle Tower]

Yes, but that still leads to problems a and b. The Jazz have NO guarantee that they could broker the deal, and they can't even speak to one of the three parties that have to sign off on the deal, or in this case, since there are three teams, one of the FOUR parties. You can't have this agreement in place and take a player someone else wants if there's no agreement with Hayward. Hayward then signs a max offer sheet for Phoenix. Now the Jazz can't make that deal.

I agree. You can't make the deal in advance. However, if the team that gets Wiggins or Parker REALLY, REALLY wants Hayward you simply tell them after the draft you're going to match any offer they make so not to even bother...unless they'd be willing to work a sign and trade which would include swapping the rights to the draft picks. It likely won't work in a multi-team scenario, but it could happen between 2 teams. But again, you're assuming Hayward has that much value.