I watched the replay. There were numerous plays when the A&M LBs crashed the line at the snap of the ball. Looks like they did that based on sets they saw and their schemes.
As I said above, Eli Gold mentioned that A&M was clogging the line. Coach Saban stated that "the Aggies used an extra defender in the box to limit running lanes and force throws."
Click here for linkBut generally, nobody on the team seems concerned about the running productivity against A&M. We prolly could have run on the edge more instead of off tackle.