I think Petras is a worse version of Stanley at this point in time. Can he get better? Sure, but Petras has looked average to below average against two terrible defenses, and looked god awful against an above average-good defense in Northwestern.
Last weeks game is going to be one of the only ways Iowa is going to win games this year imo. Force turnovers. Keep the ball on the ground as much as possible. If you do throw it, don't make Petras have to read anything or think, just get the ball out of his hands, produce on special teams.