The Kansas City Chiefs got a scare Friday when Jamaal Charles limped off the field after having his toe stepped on. Fortunately, X-rays came back negative. If there's one skill-position player the Chiefs can ill-afford to lose this year, it's Charles at running back. He finished second and fourth in the NFL in rushing in his last two healthy seasons. New coach Andy Reid has even bigger plans for him this year. Previous coaching staffs have never fully exploited Charles' pass-catching skills like Reid has with versatile backs such as Brian Westbrook and LeSean McCoy. The NFL buzzword for 2013 is "multiple." Reid and offensive coordinator Doug Pederson are using Charles as a versatile chess piece, lining him up as a traditional tailback, as the deep back in the pistol and split out wide at receiver in the Chiefs' multiple formations.