Kansas City’s rookie defensive end showed off his motor during Saturday’s game against the Bears. While the Kansas City Chiefs ultimately fell to the Chicago Bears 19-14 in Saturday’s preseason opener, they were dominant early when the regulars were on the field. Among the game’s highlights was the performance of EDGE rusher George Karlaftis — the 30th overall pick in April’s draft. Karlaftis looked unstoppable at times against the Bear’s second-team offensive line, sacking veteran quarterback Trevor Siemian for a 10-yard loss in the second quarter and almost racking up two more sacks. “It was great to go up against…