What position did Marshawn Lynch primarily play?

What position did Christian McCaffrey primarily play? Christian McCaffrey is best known for playing with which NFL team? Which college was Christian McCaffrey playing for when he entered the NFL? What jersey number did Christian McCaffrey wear with the 49ers? Marshawn Lynch is best known for playing with which NFL team? Which college was Marshawn Lynch playing for when he entered the NFL? What jersey number did Marshawn Lynch wear with the Seahawks? What position did Bo Jackson primarily play?