The only one I ever take issue with is the 1941. All the others were awarded "fair and square" as they say.
I've done a lot of research on this topic in general, and the 1941 team in particular.
Minnesota was awarded the AP regular season national championship.
However, there were legitimate nationally-recognized newspapers and magazines that awarded titles after the bowl games (even in those days).
Because of Pearl Harbor the SEC Champion, Miss State, was unable to compete in the post-season. In fact, they may have disbanded.
Bama and UGA were 2 of 8 teams picked to play in the Big 4 bowl games (Orange, Sugar, Cotton & Rose). The Rose Bowl had been moved from Pasadena to the Duke campus in NC because of fears of a Japanese attack.
Bama played an exceptionally good (and pass-happy) Texas A&M team and soundly whacked them. In fact, Bama was up 29-7 late in the 4thQ when Frank Thomas put in the 2nd & 3rd strings that allowed Texas A&M to score in garbage time.
Football Thesaurus ranked us # 1 following that win.
There are some who claim that the UA Athletic Department intended to choose the 1945 Rose Bowl Champions as one of the "Past-5" titles, but I'm not sure that's correct.
In any event, it's a longer story than this, but compelling if you're into this kind of history.
And yes, FWIW, the NCAA has finally recognized "official" national championships at the FBS level.
That was not the case until this year.
Through 2010, they simply cited NC selectors and who they selected.
So ... we have 18 or 17 or 13 or 11 or 8, depending how you want to look at the data.
I doubt the UA Athletic Department will change their official stance of 13 titles.
To do so would have a weird ripple effect:
Do you "erase" 1941 from Frank Thomas' statue??
Recall all the "Got 13?" T-shirts??
Take down the 1941 flag from BDS??
CFB is a strange game.
Maybe that's why I like it.
~XS