Here's how it might sort of makes sense. The Dolphins moved back up, wanting either Chase or Pitts, assuming SF takes a QB. That plan could go awry if ATL takes Pitts and Cinci takes Chase, as they are rumored to do. That leaves the Phins with Sewell, who is far and a away the best prospect on the board at 6, but they just used two high picks on tackles last year, so they might want to move back to 8 or 9 and take Waddle or Devonta Smith, and pick up maybe an extra second round pick in the process.