Full-backs aren't attacking players in my book (on the whole). For a team like England, they should be perfectly balanced between attacking and defensive qualities. But if you're playing for Brazil then they might need to be better offensively to suit the system - a solid midfield consisting of Paulinho and Sandro (hopefully) can cover for their wonders up field.
England need a defensively sound right-back first and foremost - how many top quality left-wingers could we come up against in the World Cup that could take advantage of a weak right-hand side? Neymar, Ribery, Di Maria etc we could all expect to play at the World Cup in the second round or quarter finals.