Wow. Bad analogy. If they played head-to-head, you toss out everything else because then you no longer have a hypothetical game but a real game as evidence. It's true. New England beat the Giants in the regular season that year just as Georgia lost to Auburn this season but then won in the SEC title game. You'd say Georgia is the conference champion.
But the NFL stages a fairer playoff system where 37.5% of the top teams engage in a playoff every year. The NCAA (or CFP) engages in a playoff system where the top 3.5% engages in a playoff system, one that appears to shut off arbitrarily any school not in the ACC, Big 10, Big 12, Pac 12 or SEC.
IMO, there should be a separate playoff among the All American Conference, Conference USA, MAC, Sunbelt, Big West and Mountain West for a nation title and call the current CFP what it truly is - a national championship among five conferences.
But since the CFP declares itself a national championship among ALL FBS schools, they should act like it and not deny teams who win every game on their schedule, plus their bowl game. They want to pretend they are like March Madness where a school like Butler or Temple could play for all the marbles when this season proves that's untrue. The CFP would have seeded two-loss Ohio State before undefeated UCF. Heck, they almost seeded three-loss Stanford ahead of UCF.
I hear that "SEC is so tough, blah blah" every year. If that's the case, the Big 10 should be playing for the national championship because they won all but one of their bowl games. SEC was middle-of-the-pack in their bowls.