I don't really think that's a great team. But a couple of injuries have forced Cheika's hand in areas.
I see the Mumm/Horwill 2nd row being a weak point. Horwill was good against SA and I'm confident of what he can bring being adequate, but not dominant (we just lack superior locks) but I've got huge reservations about Mumm at lock.
I have reservations about getting 80 quality minutes out of either of them, between the two we can get a reasonable shift.
But that equation means Skelton doing 80 against an extremely mobile ABs who will bring on Sam Whitelock to ramp up that mobility in the last 30 minutes
I wouldn't be surprised to see Fardy moved to lock for a period (10 minutes) as Potgieter & Dennis did at the Tahs