As for Rona, he effectively shut out the three Wallaby 13s in 3 successive weeks - Folau, Kerevi and Kuridrani. He and Meakes work well in defence.
Really BeeJay you must have been watching different games than I was. He was lazy getting back in D, so lazy in fact that Peni had to defend in the 13 position.
Not to hard to defend set pieces it's at the 2nd and 3rd phases where it matters.