FLOWERY BRANCH, Ga. — Only two NFL running backs have more touchdowns than Atlanta's Antone Smith.The mystery is why Smith hasn't had more chances to add to his total. Among Falcons running backs, Steven Jackson, Jacquizz Rodgers and Devonta Freeman have more carries than Smith this season. Smith has delivered four big-play scores on his rare touches — from 38, 48, 54 and 74 yards.