I think you're referring to most of the coaches on the list who only have 1 NC. Several of those coaches - Mack Brown, Gene Chizik, Jimbo Fisher - won a NC solely based on having a transcendent talent at the QB position in Vince Young, Cam Newton and Jameis Winston. Larry Coker inherited one of the most talented rosters of all time. Jim Tressel was cheating. Bob Stoops won his (IIRC) in his 2nd year with someone the previous coach's players. Yea, so about half of that list is just a flash in the pan. Some truly all time greats though with Saban, Meyer, Osborne, Bowden, Stallings, Spurrier etc..