More: Coordinator's Corner: Nick Holt ($) | Holt's linebackers delivering | Tight ends hoping to increase production; Wednesday notebook

Though Iowa has put up some big passing numbers at points this season, it hasn't done so out of a wide-open offense.

The Hawkeyes largely are under center and use two backs and/or two tight ends. It's the latter that could be especially concerning for Purdue Saturday at Iowa City.