Knoxville made a few changes on offense and defense against Grinnell last Friday and Coach Chris Hudson saw several positives as Tyler Worrall was installed at nose tackle and Caleb Robuck was switched from wing back to offensive guard. Hudson says those moves were meant to give the line a few more athletes and help with blocking and getting to the ball carrier. Hudson added both Robuck and Worrall said it was an eye-opening experience, and hopes to have a better game at their new positions this Friday against Centerville. Worrall will still be one of the main ball carriers on offense for Knoxville as he and Dylan Schrader have combined to churn up over 700 yards and nine touchdowns on the ground between them.