That is sort of something lost to the ages, with less recruits falling through the cracks, and coaches not simply rewarding tenure, the random great team. I feel like you used to get the random 1974 Orange Bowl Kansas Jayhawks, or whatever, and then discover they were awful before and after that.
Trying to think of recent examples, and I'm not coming up with any. I know I just fake used them, but maybe those 2007 Kansas and Missouri teams? I think Wake Forest won an out of the blue ACC title in there. You might get a short elite burst like MSU from 2013-2015, or Washington. But I can't think of any one off great teams recently. If Baylor could have figured out Oklahoma, maybe they would have fit? If Kansas State had avoided the one pitfall and played in the BCS champion ship in 2011 or 2012?