It probably won't happen again.
But if it does, the BCS as we know it might not last too much longer.
A mere eight months ago, college football's regular season ended with only three teams (Ohio State, Kansas and Hawaii) showing a number lower than 2 in the loss column. That's three out of 119 Division I-A schools! It's the only time in college football history that so few teams were defeated less than twice prior to the bowls.
If anything screams for some sort of playoff, it's ending the regular season with a once-beaten team atop the polls, followed by two-loss teams in the next six spots. No formula -- BCS or otherwise -- can definitively say who's the best among a group of teams that all lost approximately 15 percent of their games in such a short season.
As outgoing BCS coordinator Mike Slive appropriately pondered last December, "Is this year an anomaly? Or is this year a precursor to what we might see in the future?"
Similar questions were asked after the 2003 regular season produced no undefeated teams and only three single-loss teams from the major conferences. That was followed by a 2004 regular season in which five teams finished with unblemished records.
So don't get carried away with this parity thing just yet.
But if 2007 was not an aberration, and top-five teams continue to get knocked off with the same frequency in upcoming seasons, then something has to give. Either a new postseason format that gives more than two teams a chance to win the national championship must be implemented, or the teams must make adjustments to minimize their risk of losing games.
Look at the three teams that didn't have at least two losses in the 2007 regular season, and you'll see a common trait that probably isn't coincidental.
According to the Colley Matrix, one of the six computers used in the BCS formula, Ohio State's schedule ranked 73rd, Kansas' ranked 90th and Hawaii's ranked dead last among Division I-A teams before the bowls were played.
And that schedule might have played the Buckeyes right into a national title if not for Virginia Tech's decision to play a home-and-home with LSU several years earlier. If Tech had instead scheduled an easy, nonconference win -- even if it had been against nearby James Madison -- the Hokies would've finished with only one loss and played Ohio State in the BCS Championship Game.
It's hard to like the message sent by that dose of reality.
Under the current BCS system, with the polls determining which teams will play for the title, the damage inflicted by any one loss far outweighs the benefit of even the greatest win. How does a game like Ohio State-USC even get scheduled in such an environment?
While those teams are out there entertaining the college football world, some other team might be sneaking into the national championship game by taking a less challenging path. It's just a matter of time before that happens.
And when it does, a choice must be made by the BCS decision-makers: Either change the postseason format to give more teams a shot at the title, or give up many of the games that make the first month of the season worth watching.
Surely, the two can't coexist much longer.
Brad Edwards is a college football researcher at ESPN. His "Road to the BCS" appears weekly during the season.