While trying to stop a pro-style offense, Iowa's D tries to control the line of scrimmage. Linebackers and safeties are used to stop the run.
Michigan State uses a run-first offense. Iowa's D stopped MSU's O because Iowa stopped their ground game and forced Cousins to pass when the score became lopsided. To recap: Iowa's D is good against run-first offenses.
Iowa's D is however, at best, average against spread offenses that force one on one matchups or against pass offenses. Two reasons come to mind: (1) the D isn't necessarily effective if it dominates the line of scrimmage (2) Iowa's D (back 7) aren't made up of "quality" athletes.
Once you understand this, you also understand there really hasn't been an outlier game for Iowa's D this year.
Iowa's D played well against Arizona until their winning drive which was sparked by a long pass play. The yards Arizona gained to score the winning TD was problematic for Iowa's D. The rest was on special teams.
Iowa's D held Iowa State to low points because their O screwed up a lot.
Eastern Illinois was a mismatch.
Penn State uses a run-first offense.
Wisconsin usually runs a run-first offense. They used a spread offense against Iowa and won. Previous to this year, I believe Wisky's offense averaged around 14 points a game against Parker's defense.
Indiana primarily passes the ball through the pistol.
Northwestern will spread Iowa's D with passes. They also have a shifty QB.
Ohio State will force one on one matchups against Iowa's D.
Minnesota?
I'll say this for Iowa's D: against Indiana, I thought their pass defense was the best I'd seen them use in years. They actually tried to defend the pass catch. They even forced Indiana into a few short drives - did you notice how few punts were needed by either team in the game? But on that last defensive drive, Iowa's D reverted back to the "tackle the receiver after the ball comes down" defense.
In shoring up the pass D for Indiana, Iowa's running D wasn't as stout as usual IMO.
With Nebby entering the league and Wisky becoming a spread, that leaves 8 spread or one on one Big Ten possible opponent offenses for Iowa's D to struggle against
and 3 possible Big Ten opponent offenses for Iowa's D to dominate.
The solution seems clear to me - if you believe that defense wins championships.
To a certain extent, I agree with you. However, holding IU's offense to ONE touchdown is better than what most teams do. IU has the #1 passing offense in the big ten. I wasn't thrilled with our defense yesterday, but they played well enough to win.
Iowa scored it's first touchdown with a couple of minutes left to play in the game! Usually, you're getting beat like a drum when that happens.
IU very nearly ran up the score on Iowa's D last year, but imploded in the second half. I was pretty happy with the D overall in this year's game.
Rick had 4 or so open looks in the end zone that he overthrew. If he hits those passes (even just one or two of them), Iowa wins going away.
Arizona did move the ball quite a bit, but Iowa was playing from way behind until late in the 4th Quarter. Not so easy for the D, IMHO. Plus, it really was 100 freakin' degrees at the start (I was there). Arizona really only earned a couple of real touchdowns in that game. The rest was on the special teams, and then the weird pick six.
If Iowa can score more than 21 points a game, and the special teams perform at a "B" grade level, Iowa usually wins.
Wisky played an exceptional game this year. They have a GREAT offensive line. Too bad we missed the extra point in the first quarter. It would've been a helluva game in overtime.
Iowa still has a chance to finish in the top ten and go to another BCS bowl.
For me, I just want them to beat Northwestern right now. Go hawks.