One argument I've noticed goes like this:
In the Fry era, there were four teams in the Big Ten that had winning records over the span of those 20 years, who were in the league for that entire time: Michigan, Ohio State, Iowa and Wisconsin. The Badgers were two games over .500.
So Iowa was the 3rd winningest program during Fry's 20 years. BUT . . . all the other teams (plus the Cyclones) were crap. Where as Kirk has played in a tough conference and every program that's he's faced has been better than the one's Fry faced.
Let's look at the 20 years prior to Fry's arrival. Were those programs better or worse than Iowa? They were above Iowa in the pecking order. Fry helped turn them into crap. When you consistently beat your opponent two things happen: your program gets better,and their program gets worse. So Fry took Iowa from a bottom-dweller to TOP 3.
Fry 15-2 against Wisky
Northwestern 17-3
Michigan State 11-4
Iowa State 16-4
KF, same comparison
Wisky 7 wins - 10 losses
Michigan State 7-8
Cyclones 10-9
Northwestern 8-9
So if you assume Kirk has had a tougher schedule (and I don't because of the OOC comparison), well Kirk made it tougher by giving them hope. The simple truth is, when you dominate your opponents, your schedule looks easy. When you don't, it looks difficult. Fry diminished his competition. Kirk strengthened his.