Every NFL player starts as a prospect just trying to prove his worth to 32 clubs.The NFL scouting combine provides each prospect a chance to do just that.Everything from 40-yard dash and vertical jump to intelligence and sociability is examined and scrutinized by scouts and executives from each team, but does anyone remember how prospects performed once they're on the roster?SportsDay has perviously laid out the combine history of Cowboys greats including Tony Romo, Jason Witten and DeMarco Murray as well as new stars Dak Prescott and Ezekiel Elliott.