The right system fit and opportunity often mean more than first round talent. Joe Williams of the San Francisco 49ers and Samaje Perine of the Washington Redskins are among the less heralded backs positioned to make a run at touches.. Even assistant coaches are in the spotlight. But there are no set criteria to getting hired. The secret sauce behind this method of madness is to be patient, and let your opponent get frustrated. Starting at the very first time…