McDougal played behind Mirer for so long, he never really got the chance to showcase himself. 1993 was a great season and McDougal was not a part of Minter's defense that got throttled by Boston College in the last game of the year. He played a near flawless game against Florida State and was the last QB to preside over a bowl victory for ND. I think he merits a ranking, but not in the top 15.
Ron Powlus was a four year starter. That has to count for something. And keep in mind Holtz had this guy running the option, yet he still holds nearly every ND passing record. If Holtz had been a little wiser, who knows what Powlus' numbers could look like.