I'm not ready to write off Ertz, but the truth is that Hubener and Cook put up more points than that in every game except OU last year.
Our coaches are fantastic with QB run game. Without a qb we can/will run, our efficiency goes way down.
To me, Ertz looked extremely tentative with his knee, and our play calling seemed to try to avoid running him (except, of course, when he was cramping)