Looking at the numbers they are allowing 7.55 yds per pass attempt vs real teams. This would rank opposing offenses as the 53rd best amongst other NCAA teams. This doesn't suggest a real strong pass defense.FIFY. Their pass defense might be worse than WVU
Maybe opposing offenses find it hard to run so they pass more but then if they were really stout vs the pass you would expect a lower efficiency.
ISU is 19th at 8.8yds/att. Coincidentally UCF is ranked 20th which surprises me.