...have stubbed their toe at some point in a given season.
With weakness of next year's schedule...even a single loss at the wrong time could have the Irish at #9 at end of next year...and the crooked Committee has shown it will drop them at the end purely to favor conferences and their own/ESPN's interests.
Still believe 12-0 is "committee proof" but you don't know that about any team going into a season...and certainly not nearly a year in advance...