In the end the AB did nothing special but exploiting gaps.
The problem is they found out as many gaps as they wanted, with Ben Smith&Co. cutting regularly Wallabies' defence. And if the ball carrier was tackled after a gap, no probs, support at ruck comes quickly, Aaron Smith delivers the ball to his teammates and the game goes on.
Needless to say, McKenzie's defensive system has let down so far and it's a step back compared to Deans' one. Something must be done, either select other players, especially among the forwards, or pay more attention in defence.
Let's give him time, though.
Another point is Wallabies' inability to involve the backs in their game plan (AAC (Adam Ashley-Cooper), Folau and JOC (James O'Connor) barely touched the ball, and I don't think it was always their fault)
p.s. many say JOC (James O'Connor) is responsible for a couple of tries, I don't think so, Wallabies were outnumbered in that side of the field, JOC (James O'Connor) didn't miss any tackle today as far as I remember.
p.p.s. Peyper owes the Wallabies a yellow card at least