The impact of the Bears changing defensive coordinators, from Vic Fangio to Chuck Pagano starts to play out inside Halas Hall long before anyone will be permitted to observe Pagano and his new defense go through on-field work. That will be when and where buy-in with a new coach starts, something that’s not always a given, to which Marc Trestman and Mel Tucker can emphatically attest. That regime lost veterans starting with the first team meeting; Fangio had buy-in from when he arrived with John Fox.
But the biggest reason to expect continued excellence and dominance from the Bears defense really isn’t the coach.