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Don't get too excited, there are six outside backs in that squad.
For my money Cheika will pick Folau, Horne and probably Tomane in the side, I think Mitchell should be there, since he's played well for Toulon, but that'll depend strongly on whether the European comp is actually comparable to Super Rugby.
I also wouldn't be surprised to see Naiyavoro start, he made it to the squad on very limited credentials, why not take it all the way.