Well they'll need to come up with some way to provide equivalent value. Not likely, but maybe packaging McCaffrey and a pick, and we maybe have to give up a later round pick? If they don't have the ammo, they're just S.O.L.
If the Panthers want to move up from #6 to #4, I can think of several players I'd be interested in: DJ Moore, Shaq Thompson, Terrace Marshall Jr., Jaycee Horn, CJ Henderson, Brady Christensen, Taylor Moton, and Bradley Bozeman. I'm sure that JD could get something done. Maybe DJ Moore and Taylor Moton or Jaycee Horn and Terrace Marshall Jr. or Shaq Thompson and Bradley Bozeman. LOL