Some of the same rot hit Kelly too.

Scheme over fundamentals, lack of attention to defense and special teams contributed to the demise of Charlie and arguably should have led to Kelly getting shown the door with BVG in that disaster of a season.

The primary driver for the "success" of the last two years is owed to some coaches that drilled fundamentals into at least some positions on the team. The OLine has been fairly solid for a reason (an might be tailing off for a reason). It's not a coincidence that there has been a lot of success because of the better blocking and tackling. I also see the failures of both Charlie and Brian as having serious problems finding and retaining a group of position coaches that hone the fundamentals of their positions (and are at least willing recruiters of their positions as well). Coupled with OC's and DC's that have trouble articulating a philosophy and scheme to their charges and you have the ability to lose to damn near anyone in the country even if you have the talent to beat damn near anyone in the country.