NFL organizations are faced with tough decisions. Depends on the framing of the issue. If the judgement is "Vrabel is better than Mayo" and the judgement is "Its not or never for Vrabel", then its not a dysfunctional decision to replace him. The patriots don't exist to give Mayo a chance to "prove himself". Vrabel iwhtout the benefit of a Top QB, made it to the playoffs a handful of times, losing to the Chiefs, and Bengals and Ravens. Once in a championship game. If he had been a Bills coach this track record would be considered irreplaceable by many Bills fans.