What position did Rob Gronkowski primarily play?

What position did Tony Gonzalez primarily play? Tony Gonzalez is best known for playing with which NFL team? Which college was Tony Gonzalez playing for when he entered the NFL? What jersey number did Tony Gonzalez wear with the Chiefs? Rob Gronkowski is best known for playing with which NFL team? Which college was Rob Gronkowski playing for when he entered the NFL? What jersey number did Rob Gronkowski wear with the Patriots? Travis Kelce is best known for playing with which NFL team?