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Wouldn't the most likely (yet severely unlikely) spit NC now simply be each P5 conference producing an undefeated champion?  One of them gets left out, spanks someone in their bowl, and finishes the year 14-0 with a big-boy schedule. 

I think the difference is that any team deemed "weakest" at 13-0 to be just on the outside looking in is already at a disadvantage.

That #5 team can get one more big win. Let's say they're lucky, and they win a lopsided game against the #6 team to get to 14-0. They can never play any team ranked higher than 6th, though. because 1-4 are in the CFP.

Then let's say the #4 team (second-weakest) wins the CFP. They have to win two games against the #1 ranked team and then the #2/3 winner. So they win two additional games against teams perceived to be better than the #6 team, in order to go 15-0.

I would find it somewhat unlikely that the AP would value a 14-0 team who obviously never beat any of the CFP participants (since we acknowledge they're all undefeated) and whose best win was thereby against the 6th-ranked team in the country at the time over a 15-0 team who beat two of the top 4 teams in the final two weeks of the season. I think that's true no matter how lopsided the #5 team's bowl game was... The voters might presume (as many of us might) that the #5 team had a chip on their shoulder while the team they beat was just happy to be there, whereas they KNOW the CFP participants are all all-in.