"Ryan McAuley has withdrawn to keep English heritage option. Michael McDonald, same deal to keep Irish option open".
So this guys have to be STUNISHING in Super Rugby to get a call for the Wallabies. If they don't go to Chritchurch and beat Saders in the GF, I wouldn't call them again
I think it is pretty reasonable for these guys not to make themselves available for Australia A.
It isn't necessarily because they are likely to get picked for England or Ireland but because they aren't likely to play for the Wallabies whatsoever but as an eligible player in the UK they very much could get a pro-contract as a local rather than an import.