A big part of the reason Roof is gone and Woody is here is time of possession. My understanding is that CPJ wants a defense that gets off the field, either by making the stop, or less preferably by letting the other team score quickly. CPJ wants his offense on the field developing a rhythm wearing down the other team's defense while the opposing offense chills on the sideline. With Roof's defense it was too often our offense chilling on the sideline while the opposing offense developed a rhythm. Roof's defense had its moments, it won us the Pitt game last year, but it wasn't a good fit for what CPJ wants to do. More succinctly, no more bend but don't break defense.
Our paltry passing game last year had more to do with personnel than the offensive philosophy.