I addressed that early in the thread, although not in the OP:
I've noted elsewhere in the thread that the Bills stockpiled safeties -- J. Johnson, Marlowe, Coleman -- who barely played, if at all. Going with so many backups there when there are only two starters, both of which have been very reliable and durable throughout their careers, while leaving CB so thin was very puzzling to me. Throw in the fact that T. Johnson and K. Johnson both had significant injury history, this was always an area of concern. They should have kept Gaines and/or Munnerlyn or some other veteran and let go of one or two of the extra safeties.