In 2014 and 2015, for examples, those Iowa offenses were one of the top 5 most productive offenses during the KF era. Why would it give you some hope if Davis retires?
Not true, they were 7th and 8th of the KF era. 63rd (2014) 72nd (2015) in total offense in the Nation, Davis makes KOK look like an offensive genius.
http://hawkeyenation.com/football/iowa-football-statistically-speaking