best example is coachtilden at UCLA-iba.
he is great D1 coach, and had established himself as such by season 65. having already won an NC and three NCoY.
then, from 66 to 85 he went on a 20 year stretch where he won the NCoY 16 times! AND, during those 20 years never won the NC!!!
overall, 19 NCoY and 2 NCs.
i checked a few years for GPA, its definitely very good... almost no one below 3.0 and average might be 3.4 but not sure if that explains anything