Captaincy tactics from Pat Cummins was very poor during the first two test matches. I would say that the Australians would perform better, if they are led by someone with a positive and aggressive mindset, such as Steve Smith. And regarding David Warner, his career has almost finished. It will be better for him to retire from the test format, and concentrate on the franchise T20 leagues. Hopefully with Cummins out of the third test, Scott Boland will get another chance. He was impressive during the first test match, but wasn't given a lot of overs against the Indian batsmen.
In first 12 test matches as captain he has no competition as won 8 and lost just one with three draws this all happen at home with few were against the weakest sides mean things were completely in his favor but now first real test, and he is completely failed with no strategy working, and they are completely down and out against India with I was having prediction India will win this series by 4 - 0 and things are going into this way bowlers are doing some better stuff, but batting is having nothing even they have few world top class batsmen.
But, they completely fail to give any impression now Warner and Cummins both out of the next match which mean they are having no positive change for the better result and Indian dominance is going at the top of the game at home, but we will watch how they will play in final at The Oval.