unless the undefeated G5 team scheduled all four non-cons from the P5 including a couple that ere ranked at the end of the season
Yeah, I can see it now... "Well they beat then #15 Florida who finished unranked, and they beat unranked Indiana, and they beat Virginia Tech and Kentucky, but they finished the season at #21 and #24. Maybe they should schedule a few better teams than that, but those rankings aren't good enough compared to Alabama who beat 4 top 20 teams and only lost to #1 UGA and #10 OU out of conference."
What I think the G5 should do is create a scheduling alliance where one or preferably two of their OOC games are reserved to the end of the season then scheduled against comparable G5 teams. That way the high-end G5 teams could add an SOS boosting game because the practical problem of scheduling is that most of it is done years in advance. When Cincy made their OOC schedule of Miami, OH, MurraySt, Indiana, and Notre Dame their AD probably wasn't think about the CFP at all. He was probably trying to make some money and keep the chances of bowl eligibility reasonably high. Thus, he scheduled Miami, OH and MurraySt which he figured would be two easy wins. Then he scheduled IU which he probably figured was a weak enough B1G team that the Bearcats might have a chance at knocking them off and Notre Dame for money/exposure.
Fast forward from years or a decade ago when the schedule was made to 2021 and all of a sudden the Bearcats are preseason top-10 and they REALLY need a better schedule to prove that they belong but it is too late they are stuck with MiamiOH and MurraySt and now they really have no way to make up for looking pretty lackluster against IU and Navy.
That's the problem. Schedules made MANY years in advance, so a team like Cincinnati can either schedule 4 P5 teams and have scheduled 4 losses before the season starts, or they can make a mixed schedule that has wins and a tough team or two.
Honestly I think this idea, though, is something that should be done for ALL of college football, not just G5. It was an idea a coworker (Boise State fan who knew the glass ceiling existed) came up with. Last two weeks of the regular season are out of your control. You get one home game and one away OOC game, chosen by someone [the CFP committee?] to match up top teams with top teams.
If you really think G5 can't compete (as I do), then they'll play themselves out of contention over those two weeks. See what Cincinnati does playing two high-profile P5 teams. If they really think they can contend, well then it gives them the chance to prove it on the field.
This idea, of course, was back in the BCS era where you were trying to select two teams, not four. But either way, it separates the pretenders from the contenders.