By Jimmy Gillispie LEE’S SUMMIT — Needing a spark following a scoreless first half, the defending Class 6 state champions were propelled to victory by a sophomore with outstanding speed. Matthew Ahrens quickly put himself on a list of football players to watch in the Kansas City area. On Friday night, he scored two touchdowns – both on runs of at least 30 yards – and helped Lee’s Summit defeat Blue Springs South, 20-17, in the season opener. “We knew we had to make it ugly to