Saving it for when it is needed. As an offense you don't want to show everything early in the
season. Over the next few games, I think you will see ND add more levels to the offense if needed. The same was said about the running game just 2 games ago.... and now Denbrock is heavily relying on the running game.
ND is #4 in the nation in SCORING OFFENSE (44 pts/game), so I don't have a lot to complain about.