Bancroft is playing. It's not a choice between him and Marsh.
At number 6 you've got the following options: Marsh S, Maxwell, Lehman, Ferguson, Cartwright, maybe Kurtis PAterson, Henriques (like Cartwright, only if you want to play 5 bowlers).
Renshaw is in terrible form and to me looks like a bloke who will hang in there 40 minutes, get 5 runs and edge to the keeper. I might have been tempted to give him one more test.
We also blooded rookies like Nick Maddinson.
This is the Ashes.
I'd probably have gone with Lehmann. But I think Marsh will do ok.