Nah, not right. In Mack's case, he should have been higher in the pecking order for a Brumbies wing spot than he was. It is not usually the case that these players are in competition with current Wallabies.
The Brumbies had Henry Speight, Chance Peni, Toni Pulu, Solomone Kata, Andrew Muirhead, and Tom Wright on the roster through the years Hansen was with the squad.
Henry is one of my all time favourite players and would make my all time best Brumbies side. But by 2021 he was not the same player he was when with the Wallabies, or in earlier days with the Brumbies. Peni and Kata were just ordinary at Super level while Andrew Muirhead (the man has some longevity and tenacity doesn't he?) was probably on par with Hansen. Tom Wright was probably the only one who was better. It is arguable, and actually clear to me, that the Brumbies retention program fell down badly in this case. And it seems that Mack left for overseas because no other franchise wanted to offer him a contract after they were all approached. Beats me why the Tahs (or was it the Reds?) at the time didn't see his worth after he was instrumental in causing a last minute loss for them in an earlier game.
Not saying that every situation is similar to Mack's, but there is something drastically wrong with our systems and competitions in this country when we see so many of our next wave of players opting to go overseas and play for other countries.