What position did Larry Csonka primarily play?

What position did Bo Jackson primarily play? Bo Jackson is best known for playing with which NFL team? Which college was Bo Jackson playing for when he entered the NFL? What jersey number did Bo Jackson wear with the Raiders? Larry Csonka is best known for playing with which NFL team? Which college was Larry Csonka playing for when he entered the NFL? What jersey number did Larry Csonka wear with the Dolphins? What position did John Riggins primarily play?