Just rewatched the game and took particular notice (and count) of the number of times Foley, To'omua and Cooper took the ball at first receiver from set piece or ruck/maul.
In the time Foley was on the ground, he took the ball at No 10 17 times in which he kicked on 5 occasions. Matt To'omua took it at No 10 18 times and kicked it once (clearing kick from his in-goal to about 10m from halfway). Almost 50/50 between them playing No 10 when in possession.
After Quade came on, he (Cooper) took it at No 10 on 13 occasions and Matt on 9 occasions. Quade I think kicked it 3 times in general play.
Make of this what you will, but I believe it demonstrates the game changed once Cooper replaced Foley, and it is my impression at least that the Wallabies' attack was more directed and more threatening to the defense. In this period, we saw a few occasions where the backline actually worked in their nominated positions and made some very good ground, See eg the backline move White > Cooper > To'omua > Folau> Speight which made about 30 - 40 m down the right hand side, and a couple of occasions White > Cooper > To'omua > AAC (Adam Ashley-Cooper) down the LHS, also making good ground.
And it's probably unnecessary to say that Matt To'omua did not on any occasion defend on the wing.
This was only one game, and I accept that Foley has had better games especially in the series against the French. He is not rubbish, but my preference would be Cooper at 10 and To'omua at 12.