Not sure which 5-6 the ones that left or the ones that didnt

They were all failures in some sense of the word. Namely, that they couldn't lead an ND team to win a big game vs a top tier opponent (@oklahoma being something doesn't prove that much in the ned). So is it that the ND coaches recruited flawed QB's that were never any good or was it good QB's that didn't have good coaching? Highly or lightly recruited QB's all seem to end out the same way. So either the coaching staff are crap at evaluation talent or they are crap at teaching the talent or perhaps both?