Aussie big 4 have his number for sure. Boland is a much better bowler in Aus conditions- he was whacked in England, but in Australia he is tough to top. Only a peak Bumrah topped Boland in the recent series.I don’t know that Aus would be worried with either of them batting three tbh. Pope because he’s shown himself pretty middling over a decent sample size, and Bethell because he hasn’t proven himself yet.
But I think if they had to choose, Aus would prefer Pope there - he’s a known quantity and I imagine they believe they have his measure
Zack Crawley , Brook and Root will be the main challenges. Crawley gave Aussies a very tough time in the last Ashes in England, he was incredible.