Strongly disagree on Cooper.
Cheika has used 36 players for the Rugby Championship. Some players have got 3 or 4 games. Some only 1. I'd say the 5 that don't make it will be out of the 7 that have only had 1 game. That puts the following at risk:
Horne
Tomane
Speight
Genia
Higginbotham
Palu
Douglas.
Many speculate Tomane and Higginbotham won't make the cut, so that means it's 3 of the remaining 5.
Having only played 2 games perhaps Mitchell, Foley, Simmons and McCalman could be at risk, but I'd bank on the first list of 7 being where the 5 come from.
In terms of Cooper, I'm mainly going with Gagger's comments on the front page about it being a bit of a last chance saloon. I tend to think that unless QC (Quade Cooper) has an absolute shocker he'll certainly be in the RWC squad. The only alternative I can see to leave him out is to decide that To'omua is your 10 option and draft Leali'ifano into the squad as another 12 option. Realistically I see Cooper being in the RWC squad.
Higginbotham isn't in this squad. I think he needs at least one injury and probably two to have a chance. I really don't think he'll be in the RWC squad.
Are you sure your numbers are correct? If we've used 36 players in the Rugby Championship and that only includes 4 props and 2 hookers, that's already 2 extra players that need to come in for the RWC squad.
McMahon has been in every squad but not played. I think he's very likely to miss out.
Qwerty's latest list on
Wallaby 31 players for 2015 RWC thread looks pretty accurate to me. I tend to think Speight, Cooper and Palu are extremely likely to be in the RWC squad unless they have a shocker and Douglas really needs to play well to have a chance of going.