Why would Iowa be expected to have a "worse" defense this year?
Return the core of our back seven -- many achieving upperclassmen status now -- and against return marginal experience on the DL. The back seven will very likely be better -- especially so compared to what you guys saw from us last season in Ames... when we still hadn't settled on personnel.
The DL is the question mark. They played mediocre in the first half against NIU, much better in the second. Tough to say. Against you guys last year our DL played terrible. Hopefully we're further along this year. If we are, I'll bet that the defense is ahead of where it was last year at this time.
Don't get the speed comment. Two areas we could improve speed wise are: speed rushing DE, and higher end speed guy starting at WR. But aside from that...have TEs who can really move, LBs as quick as we've had them, and CBs who are fine manning up outside. RB is definitely quicker than last year as well.
At any rate, though, I don't think there is some big speed discrepancy that will be a large determining factor.
Iowa has a worse defense than last year and no receivers that can get open. That's not because of NIU returning 45 starters from last year. We have more speed. Jantz is comfortable. We will run the ball. Knott and Klein make an impact. We win. And look, I lived through the thrashings in the 90's et al. This is a different team and it feels different. I just hope our kicking game is solid.