It was against their only common opponent.No it's not, Delaware is in no way close to Iowa in anything. Shutouts in football are flukes. Iowa was hampered by a better D in sub optimal conditions. Iowa plays Delaware at Beaver Stadium instead of PSU that day, Iowa destroys them. Comparing this team's performance to another team's never pans out because it's just a different event.
Iowa's offense isn't good, but Delaware's isn't better.