What position did Todd Gurley primarily play?

What position did Roger Craig primarily play? Roger Craig is best known for playing with which NFL team? Which college was Roger Craig playing for when he entered the NFL? What jersey number did Roger Craig wear with the 49ers? Todd Gurley is best known for playing with which NFL team? Which college was Todd Gurley playing for when he entered the NFL? What jersey number did Todd Gurley wear with the Rams? What position did Michael Thomas primarily play?