Actually I think your right, in the match day thread I said first scrum of the game it was in the second half..
There might have been one on the first half which I think was pretty stable. Slipper was off before 60 minutes so I don't think he had another and Horwill spent most of the second half in the bin so they may have been packing more than a few against 7, I went on to wipe most of the game from memory though so I can't be too certain.
As far as wallabies props go it's Slipper and Sio for loose head with no one else anywhere near them. They're both our best scrummaging props and our best around the ground. While Sio's early form has been excellent Slipper's has still been good, if a little interrupted, and I wouldn't be swapping the pecking order, particularly with slipper proven at test level. That said I'd probably give Sio at least one start in the RC potentially resting Slipper completely fro a game in prep for the world cup. Maybe look at Robinson, Cowan or Smith then, though it might be better try one of the tightheads who can arguably play both sides at loosehead.
As far as tight head goes it's Kepu starting with a bit of a log jam behind him. It'll become clearer as the season progresses and more of these guys come up against each other and Boks/Blacks but we'll probably need to try a few in the RC, again possibly resting Kepu once to keep him fresh for the WC. atm it looks like Alexander, Weeks, Talakai and Faulkner, but one more week like the last two and it'll be hard to argue for Faulkner, even though he looked ok in the EOYT. I'd expect Holmes to be in contention when he comes back from injury but if Talakai keeps it up he may struggle to get the start back and who knows how his shoulder will go. I suppose Ryan could come back into contention but after last years awful cameo against the French he'd have to do a hell off a lot.
If we take 5 props to the WC I'd expect 2 looseheads (Slipper and Sio) 2 tightheads (Kepu and ???) and a tighthead who can play loosehead (???). I'd expect Alexander to take one of those spots and atm Weeks is looking best for the other. I can only really see any of the other looseheads in the squad in the case of an injury.