Nets go all in after the future of their franchise in Dylan Harper, trading CJ while he still is at the peak of his value and consolidating their draft capital and getting a solid young player in Vassell (who might be worth less than his contract but that's ok because the Nets have infinite cap space). Still leaves them with 3 first rounders in the 20s.

Spurs give up their #2 overall pick as well as Vassell and KJ but still keep some draft capital and get a super consistent 3/D wing in CJ and an efficient, veteran tertiary scorer in DeRozan. A starting lineup of Fox/Castle/DeRozan/CJ/Wemby would be scary on defense and offense. Resign CP3, sign a veteran backup C (Brook Lopez, Al Horford?), a few young wings still on the roster, you still have HB's expiring to be able to make midseason moves too.

Kings get in the draft, get younger, more depth, and free up the awkward fit between Lavine/DeRozan. There's already been talk about the Kings getting into the draft to get Jakucionis, and that DeRozan and Monk were being shopped, so they can build on a somewhat weak young core and focus on fit instead of talent. If any of this seems unfair you can swap the picks around to make it work