There doesn't need to be a particular one. Gus picks a team for each match - witness last night. Who'd have thought he'd play NONE of the three wingers?
Depending on the opposition, Harley might play ahead of Sparrow, or Vince (in last night's set up). Equally it could be in place of Dicker, if we wanted a slightly more attacking stance. Or even in place of a winger.
Who knows? (Not the other manager, for a start...)
well said.