This also seems like an exceptionally bad off-season to try to clear cap space, let alone dead cap space. On top of rumours that the cap may not actually rise all the way to 83 mil, the following teams are probably trying to clear cap space ATM:
Definitely:
Vegas, San Jose, Toronto, Calgary, Tampa
Probably:
Pittsburgh, Edmonton, Washington, Boston
That's almost a 3rd of the league. And I'm not sure they're the only teams in that category after free agency. Plus, I don't think there are that many teams with flexibility to take on dead cap space.