2017 (UCF went undefeated), 2015, 2012, 2011 (got a second chance at LSU). In 2011, LSU even won more games.
UCF: The G5 aren't getting in unless they go absolutely bonkers with their scheduling. Until they do (and it won't happen any time soon), they are ineligible for the playoff. But, for the sake of argument, why is it a problem that 1 loss Alabama got in over unbeaten UCF, but not any of the other three 1 loss teams that made it in? Or, for that matter, what about any of the 12-1, 11-2, 10-2, or 10-3 teams that were all ranked above UCF in the final CFP poll (and in the AP and Coaches polls as well)? As always seems to be the case with your positions, Bama seems to be the issue at the expense of all else.
As for 2015, 2012, and 2011, they doesn't fit your argument ("Basically Bama needs to lose 2, and
they are other teams that can go undefeated and not even make it in the playoffs.") Which undefeated teams didn't make the playoff (or BCSNCG) that Bama jumped over? And as for 2011 LSU, that's irrelevant to your argument since Bama did not get in at their expense. Bama got in over an Okie Lite team with the same record.
In fact, the last 6 national champions over the past decade with one loss are Alabama, Clemson, and Ohio State. Imagine that?! Almost every other teams absolutely has to go undefeated and even then, it isn’t good enough sometimes.
Which undefeated teams were available to be selected in any of those years?
2011 Alabama - Beat lone unbeaten LSU in BCSCNG
2012 Alabama - Beat lone unbeaten Notre Dame in BCSNCG
2014 Ohio St - (edit) FSU was the lone unbeaten. They lost to 1 loss Oregon in CFP semifinal
2015 Alabama - Beat lone unbeaten Clemson in CFPNCG
2016 Clemson - Beat lone unbeaten Alabama in CFPNCG
2017 Alabama - no unbeaten teams
Hell Ohio State got in the playoffs last year after playing half a season.
Who should have been in over tOSU? Texas A&M? That's the only 1 loss team that played close to a full schedule, and they lost to Alabama by the exact same score as tOSU.
I realize you can argue specifics of each year in a vacuum, but it is clear that Bama - along with a handful of other schools, absolutely can get a mulligan game and are given priority in the right circumstances.
Apparently "the right circumstances" means "there weren't 4 undefeated teams in a given year."