While you are correct in not pointing out Beale was solely to blame. but every attack from the ABs went to wherever he was. They kicked early to get there quickly before cover can come over, they ran wide. in my humble opinion KB is not a starting player. to do that you need to defend in the front line. QC learnt this and can now do it. until that occurs, KB should be a bench player.
Palu goes missing against big team. when was the last time he had a good game against the ABs, SBs or England?
TBH your article appears Tahs focused. while that is a good thing, as when the Brumbies won their 2 (notice 2 :-) ) SR trophies, the Wallabies were laden with Brumbies. But you seem to miss the fact that large backs use KB as a doormat. Basteraud did it, Nadolo did it, this puts the whole team under pressure.
I don't know what games you watched, but Toomua is a great defender in the mid field. remember his dominance over Beale/Foley in Canberra earlier this year? Clearly not. he has to be either 10 or 12. my guess is that he will probably actually take a lot of the 10 responsibilities of KB to free KB up.
McCabe should have been a starter all year for the Brums, I just wonder if it is about managing his injuries?
I think the back 3 is interesting, it seems to indicate an intent to run. none of the back 3 are known kickers, by that I mean return kickers. I think this team is going to run it.
For that you need a tough player like Toomua to complement KB. look at the great Wallabies side they have all had that. Tim Horan outside Michael Lynagh and Steven Larkham. that worked just as Toomua outside KB will work.