I'm using Sports Reference as the source.Where are you sourcing your data? Is that final AP rankings or at the time played. What was the same for the last 5 seasons Norm coached?
Finally why are you arguing the defensive coordinator is responsible for the ultimate record? Last I checked, Iowa's defensive ratings have been on par if not better than Norm Parker's.
Are you going to address those numbers? in the last 6 seasons: 5-13 against ranked opponents. 1-4 in Bowl games. Is that the resume of a great coach? Yes or no? Avg loss @ 20 ppg in the 4 Bowl losses. Bowl games are usually against quality opponents. Ranked opponents. I don't consider the past 6 seasons to be anything but mediocre (2015 not withstanding).
Those are the numbers since Norm Parker officially retired. Which back up my claim "His resume is a little light since Norm left". That's why I provided them.
In the end, It's a difference of opinion. You have yours and I have mine. And I'm ok with that.