I can't remember which former player said this, or it may have been multiple, but most coaches don't abandon a system that they have. They will "introduce alternate concepts" or "tailor it a little", but that usually doesn't indicate that a given coach is going to switch whole hog from a WCO balance type of offense to a run heavy spread offense.
Now if you look at just what's happening, you can see remarkable "symmetry" in what NU is doing. 216 rush attempts to 218 pass attempts. By luck or design, that's pretty darn even for even a staff who aspires to such symmetry.
If you break down the rush attempts, we basically have two primary ball carriers. Newby and Armstrong. Newby with 90 carries, Armstrong with 45. So you have a 2:1 ratio between a back and QB making things happen (by design or on a break down). Cross Janovich hover around 20 carries, and Ozigbo 12. The receivers are hovering around 10 carries each for those who get to carry the ball.
I think if you broke down the situation, whether its a anything goes down (1st and 10 or 2nd an 7), and charted the percentage vs 3rd and short, vs the percentage of "changeup" plays like fly sweep or gadget plays, you'd get a fairly good correlation to our carries chart.
So no, its obvious that Riley and Langsdorf aren't from the TO school of offense. But if you change offensive systems, and your QB is still the 2nd most rushed guy on the team, and his overall carries per game drop by 4 from "the good old days", I'd have a hard time saying that *by the numbers* you've pulled him way away from his groove too far. Now watching the game and ignoring the numbers its apparent we can make more hay running TA a little more. There's a lot that can be said about whether our run game is good or not, or whether we should use it more, but when you put pen to paper and look at the ratios of carries and what happening in games situationally, its too beautifully arithmetically structured to be random chaos.