The Aztecs were 6th worst in the country in keeping their quarterback upright. They allowed sacks on 10.2% of pass attempts. To make matters worse, they didn't accompany this with high yards per completion - a high sack rate means the quarterback is holding the ball too long but often in exchange for some big plays downfield. The reason a sack rate is high with good line play is that the quarterback is a legitimate threat to scramble; A&M's sack rate was a "weakness" of the offense, especially considering the quality of the offensive line and Manziel's escapability, because Manziel risked sacks for the opportunity to break a long run. But Katz and Dingwell averaged 4.2 and 2.4 yard per carry, not exactly Manziel, Mariota or Lynch.
The story changes when we split Katz and Dingwell. Katz had a 6 point lead on Dingwell in sacks per pass (14% to 8%, respectively); Katz was sacked only slightly less often than sack specialists Jeff Driskel and Kiehl Frazier (Frazier was sacked twice for every seven completions!). And Katz gained 25+ yards on 10.4% of pass attempts, better than all but 12 FBS quarterbacks. Only Tajh Boyd, AJ McCarron and Aaron Murray attempted more passes and gained 25 or more yards at a higher rate.