When McD was the DC in Carolina, they had a complete refresh of the DB’s that did not go so well. It coincided with Norman’s exit, I believe.
I seem to recall McD being asked about it early on during his Bills’ tenure. He made a remark that he felt the lack of continuity of leadership in the position group hurt more than he had anticipated.
With that in mind, I could see the Bills hanging onto one of Hyde or Poyer for at least one additional season. I have a hard time seeing how both will be back, however. That pairing has, unfortunately, run its course.