What position did Frank Gore primarily play?

What position did Rich Gannon primarily play? Rich Gannon is best known for playing with which NFL team? Which college was Rich Gannon playing for when he entered the NFL? What jersey number did Rich Gannon wear with the Raiders? Frank Gore is best known for playing with which NFL team? Which college was Frank Gore playing for when he entered the NFL? What jersey number did Frank Gore wear with the 49ers? What position did Alvin Kamara primarily play?