In my opinion you have to win more than 1 NC over a span of 4 or 5 years to be considered a dynasty. They should have stopped at the top 10, the last 2 are questionable to be on there. It is a shame Ohio State lost the last game in 1969, 1970, 1974, and 1975 (and I could argue the 1973 team deserved at least a share) to cost them the NC. That would have been 5 NC's in 8 years and would have been the greatest dynasty of all time.