You know what Mike Leach and Lincoln Riley and etc. also have in common? Their defenses suck. It is just the nature of the beast that you can be great on one side of the ball and you are probably not going to be any good on the other. For those spread teams that play with tempo, they run a lot of plays and have a lot of possessions, thus, why they are high in the team offensive ratings. But that also gives their opponents a lot of possessions and they also run a lot of plays. That is really hard on a defense over the course of a game and season, and unless you have a plethora of depth on defense that philosophy will hurt you.
We just have a totally different style. Limit possessions, limit plays, play games in the 20's not 50's, preserve our defense, protect players from injury and fatigue. I personally like this style, but like it or not this is Iowa football. We will never be high in those offensive rankings for those reasons but it doesn't mean we can't be a highly efficient offensive team.