As you can see, Alabama is in a league of their own. Clemson and ND are very similar but Clemson edges ND in both defensive points allowed and offensive points gained.
ND has been hurt by red zone efficiency. If ND was better in the red zone I think their numbers would actually be better than Clemson’s but still short of Alabama.
What stats can’t tell us is how teams will react if ND’s “ball control” offense moves the ball and scores in the red zone? Does limited possessions for Alabama/Clemson mess with their rhythm? Give ND’s defense enough juice to make a few key stops?
Link: https://www.footballoutsiders.com/stats/ncaa/fei/overalloff/2020