KANSAS CITY, Mo. — They have a new quarterback and a new middle linebacker. They’ve released veterans, traded away one of the top cornerbacks in the league, signed wisely in free agency and loaded up on draft picks. Sounds like a losing franchise trying to turn things around. Try the two-time and defending AFC West champion Kansas City Chiefs. The slew of offseason moves began even before free agency, when the Chiefs agreed to trades that sent quarterback Alex Smith to the Redskins and cornerback Marcus Peters to the Rams.