What I wrote - and maintain - before it was trendy to say so was that the Top Six countries are roughly equal, with retirements meaning that Australia and South Africa were declining while NZ were improving.
Since losing the Ashes, Australia has replaced Rogers with Burns, Clarke with Khawaja, Starc with Siddle and Johnson with Bird.
I don't think that constitutes an upgrade, do you?
So how many test matches have NZ won against Australia so far. Do you even read what you write.