That’s a good question, and everyone certainly loves it when old players/coaches return. I think the problem is that it would put a shadow over Matt Patricia, and perhaps retard his development. Now there surely an argument to be made that he needs a shadow over him given the Pats defensive performances of the last three seasons, but it’s my belief that Belichick will want to give Patricia room to grow, without feeling like he’s suddenly been knocked down a peg. Maybe it could work, but I think if it was going to happen it would’ve already.