Brian has done some things with the running game the last couple years that Iowa wasn't doing before- more inside zone, tosses/sweeps, pulling centers, some misdirection, etc. There is no reason to believe he won't make similar tweaks to the passing game.
His success in improving the run game speaks for itself. Iowa has averaged 4.5 yards per carry both years he has held the run game coordinator title, which is better than every year since 2008 when Shonn Greene was the best RB in the country.
Big Ten defenses were also terrible this year