How about this:
2016: Snyder Head Coach, BV HCIW and DC (Hayes gone).
2017: BV Head Coach, Snyder Offensive Coordinator--Schemer, Dimel (or somebody) Offensive Coordinator--Playcaller.
Snyder can still gameplan/scheme with the best of them. He is perhaps not the best at making quick decisions. So, Snyder stays on to do nothing but gameplan/scheme on the offensive side. Somebody else can call/pick the plays that Snyder has produced (with Snyder up in the box analyzing during the game, of course).