Snow is not reinventing the wheel here with the defense. He's just teaching them how to use the talent they have been blessed with.
It also helps that he's familiar with every kind of defense known to man. He can mix and match coverages and blitzes in anyway he can think of like a mad scientist and still put his 11 kids against your 11 vets and make you look silly 9 times out of 10.
I will repeat it again for those that are slow on the uptake, never under estimate a coach who's seen as many winters as coach Snow. Rhule didn't bring him to the big show out of some misplaced loyalty to an old friend. That old fart has seen some things.