Each situation is in fact different--the statistical parallels, in this case, I believe are mainly coincidental--except for the simple fact that each time the eventual winner of the 2nd meeting/Championship Game played their rival close in the first meeting, and benefitted by experience and familiarity in the second game. However, that rival had equal opportunity to take advantage of the same set of circumstances, and apparently failed to rise to the occasion. It's a rather small sample to draw any hard conclusions regarding "covert underlying trends", don't you think?
As for this latest stab at SOME version of a "pseudo-play-off system", whether called a "1-4/2-3 semifinal leading to a Championship Final", or doing the same thing, moving it around among the Bowls and calling the eventual Final a "Plus One Format" is mainly just a silly bit of semantical obfuscation. There will ALWAYS be some argument at the low-end dividing-line no matter HOW MANY teams are involved; at least we get something CLOSER to a proper Championship this way, something that eliminates a good deal of the chance for injustice in the case of a 3rd and/or 4th great team being "left out", but still preserves their precious (in terms of tradition AND commerce) Bowl-system intact without damaging "the sanctity of the regular season games' importance" (which I agree is unique and central to College Football's place in American sports and the hearts of its fans). Any attempt to accomplish one without upsetting the delicate balance in the other was ALWAYS going to be a compromise--and this one makes a certain amount of sense.
(Frankly, while I have long been a proponent of SOME kind of end-of-season semifinal/final set-up, I have also always had great suspicion at what any sort of large, complex approach presided over by the NCAA and some kind of power-brokered deal-in-committee type-of-approach might yield--that'd just end up the result of so many back-room compromises and favors-called-in as to be a completely entangled mess we'd NEVER get rid of...if they're going to do it at all, best to "keep it simple, stupid", you know?--and this "4-team"/"plus one" approach that adds either one or (at most) two games, depending on how they set it up, to the bowl system seems the best way to "K.I.S.S.".)