Since several coaches left on their own to take other positions and were not fired, I really have no idea why you assume the coaches that made the most impact are still with the Dolphins. In looking at the coaches from last year compared to the coaches now with the Dolphins, it certainly appears they had a better coaching staff last year.I believe the coaches that made an impact are still here and those that didn't are not.
Of course I hated the Gailey hiring and the new OL coach has been terrible in recent years. So I guess we will have to wait and see how effective this new coaching staff works out.