Would you do:
Favors plus a 2nd rounder for Fry (and possibly Crowder) and the Cavs #30 pick
Then do Cavs #30 pick to Chicago for Mirotic
Why the Cavs do it? They shed almost $3 million which saves them $12 million in luxury. Crowder hasn't been a great fit so they get the relief.
Why don't the cavs just do Favors for the pick? Because the Cavs would end up paying WAY too much taking back more salary (something like $40 million) unless they shed salary. Dumping Fry makes more sense than Crowder, but Crowder has played poorly and if they give up on him...