I guess you do this trade if you're sure MKG is a franchise player..... dead sure.
Requiring a franchise player is way too much for that package. Anyone would trade that for Anthony Davis in a heartbeat.
If you look at the package as Jefferson's expiring, GSW's 7-9 at best and 2nd round picks worst case, and Utah's 15 or worse pick then what is the package worth? I think an Andre Iguodala or Luol Deng caliber player is easily worth a potential late lottery + late first round + bad contract. Does Charlotte need to take back Bell and/or give cash to even it up? Throw in a 2nd rounder?