This is where timing and JRs deal is unique.
SAC, NY, and New Orleans will all likely be looking to add players in FA. They aren’t going to rent out that cap space until they know for sure that all their targets are going elsewhere.
MIN would need to clear that room just prior to the start of FA to make that max offer sheet offer to Russell(though he could be denounced by BKN and become a UFA)
So given that they need to move TWO big deals, the Cavs can help them in a huge way because we have no chance or way to sign FAs and we have JRs unique contract. The timing of FA and the hope that most teams have of targeting and adding 1-2 FAs with their cap space makes the JR trade still very possible IF the Cavs are willing to do it, go in to the tax, and then sort out dipping back down under it later