The ability of Marshalltown finding, corralling and trying to slow who is in jersey No. 18 for Iowa City High will carry a lot of weight in which trophy each respective team will hoist later tonight. The fourth-ranked Bobcats tangle with No. 1 Iowa City High in a matchup of 13-0 teams for the Class 4A state football championship at 7:05 p.m. at the UNI-Dome. The Little Hawks are led by senior quarterback A.J. Derby, that No. 18. Derby has verbally committed to play at the University of Iowa and received offers from many top schools from across the country. The 6-foot-4, 223-pound Derby is listed as the top college prospect in the state for the Class of 2010 by ESPNU and also will play in the U.S. Army High School All-American game. “There’s no question he’s very important,” said Iowa City High head coach Dan Sabers. “Obviously at the quarterback position he has the ability to do a lot of things for us.