Right. The running back position is the shortest career of all positions in the NFL due to the punishment they take. Sam is often used as a running back in this offense. He is not running because he is exercising an option of an RPO offense, like other college quarterbacks. In many cases he is a between the tackles running back and leads the team in yardage gained. Coach Patterson refers to him as a fullback playing quarterback. Sam will see more injuries in this scheme because that is the nature of the running back position, expecially when the runs are into the teeth of the defense. Great running backs at least know how to make tacklers miss and reduce the head on impact. Tony Dorsett and Emmitt Smith were masters of this. Sam has none of these skills.
Quarterbacks have scrambled on outside runs and draw plays by design, or for recovery on broken plays, since the beginning of the game. I don’t know of a single team in the NFL that had designed running quarterback plays into the line like those of a running back. Texas does this to get an extra blocker, but it does so at the expense of wear and tear on the quarterback. Although he is a gamer, I do not thonk Sam can take four years of this. The average career of an NFL running back is less than three years.