On Iowa podcast has actually covered this quite a bit this spring and summer. Over the course of the full season, Iowa ran a considerably more diverse set of formations and better run/pass ration last year than most realize. for example, Iowa almost never ran out of a 3 wide/1 back formation, whether under center or out of shotgun. last year, that number ballooned up to almost 35-40%.
Brian had good games as a play-caller (see ISU, OSU), but some real stinkers too (see MSU, Wisconsin). Play-calling aside, what also held the offense back was inexperience at the skill position players outside of Wadley, and a much more inexperienced O-line than anyone anticipated, with Jackson and Wirfs starting at the tackle positions. On paper, this should be a much more talented and experienced offense than we had a year ago. Simple progression should count for quite a lot.