If the question is what team could have beat a team like Iowa with a second stringer and a lead, that would be OSU 2017. Dwayne Haskins or Joe Burrow could have done it. Joe Burrow almost for sure because he is a great game manager and Iowa has a mediocre qb and would not be able to score much, if at all if the other team is moving the ball. Haskins came in around late in the 3rd quarter against Michigan with OSU down after a Barrett injury and played a nearly perfect game to beat a huge rival (but not a top 5 team). Beating Michigan while coming in cold is what won the job for Haskins the next year. Joe because of a hand injury in pre-season never had the opportunity to prove what he could do under fire in a meaningful game.