That size with that speed is kind of (not human) LOL. They say that if he was a track guy and not playing football, he would drop his weight quite a bit.
As per Sports Illustrated, at his height, he'd likely need to cut about 30-40 pounds while maintaining his lean muscle to achieve more of a 'sprinter's body.' For reference: Jamaica's Usain Bolt, who measures in at 6-foot-5, set the 100-meter world record of 9.58 seconds in the 2009 Berlin World Championships at 207 pounds.