The biggest surprise is Quinn, who is not playing the scheme he was his whole career. This is a brand new DC apparently. If it weren't for that, we'd probably be blowing fourth quarter leagues regularly. Quinn has been horrible defensively for years.
That being said, this team had talent anyways, Garrett was the problem as far the culture. Jerry letting him go was basically a sign that he has moved on from the main emotional tie that was a hindrance in making necessary personnel changes. The play calling is still in the hands of the coordinators. Not sure how much influence Mike has had in that department, but I do think his WC coaching tree had influence last year when Dallas went to a quick passing attack for the WC QB Dalton's stretch after the bye.