I was just saying to my dad when Cummins came in that I'd probably want him at the crease out of anyone in the team in a situation like this - and that includes all the batters!
Hard to imagine there'll be any changes now. Much as the collective batting hasn't been what we would expect, everyone's put their hand up at some stage in the summer, and let's be honest, Steve Smith has a career's worth of credits in the bank.
Incidentally, Pat Cummins's record as captain: 18 wins, 7 losses, 4 draws. Over 60% from what is now a good sample size, comparable with the all time greats.