so you are saying that the perth side, which contains non West Aussies, is an entity on it's own
I'm not sure why you're arguing this, but it is more or less a WA team, and everyone at the WACA will treat it as such.
Muirhead is the only Australian that plays for another state. Everyone else plays for WA. The coach is the WA coach, the captain is the WA captain, they have the same home ground, they're run by the WACA...