I see that Kepu is training now and is expected to play 40 minutes for Randwick against Eastwood on Saturday. If he passes that test he could be on the Wallaby bench against Samoa.
Before he was injured I thought he had overtaken Slipper as a THP scrummager and was the best in the country. Alexander, who switched back to THP only in Rd. 14, could find himself starting against Samoa with the 3 jersey because Slipper is also injured now and would have had the week off anyway, had he not been.
Of the others: Baxter is just on standby, Holmes has started in just 2 Super games (in effect) at THP, and all other Oz THPs are either injured or not up to it, or both.
I would prefer Baxter for a one-off test but that match will not be all be about a win against Samoa - but about the RWC also. If Kepu and Slipper are healthy Baxter won't be at the RWC but Alexander may be, to back up Fat Cat.
It underlines how important the prop triumvirate of Robinson, Kepu and Slipper is to Oz's RWC campaign.
It's good to have a second one ready to go, or near enough.