Just on the Ziebell playing half back I found a NM members Q&A session online dated Nov 30 and someone asked this very question. And Noble responded as per below.
No, look, I think he can. How long he plays it for... but look, he's an experienced campaigner. I believe that he sees the game really well. There's no reason why he couldn't drop in there for a period of time. I think one of the earlier questions was, what are we going to work on with some of these guys? That's an example of the older crew being a little bit open to some of those other areas. And look, if it doesn't work, mate, you put it away, but it may work for a period of time and then allow us to develop another person or another young guy in the half-forward, or in the mid. So that'll be something that we'll look at as we go.
In another question about where Josh Walker (whom I do not know that much about) would play, Noble answered as per below. Interesting for anyone running with Goldy.
It'd be unfair of me to say where that is. He probably has a preference, but he understands that there may be a time where we just need an additional support, an experienced campaigner to go and take another forward and help Cam (Zurhaar) or Larkey out down forward if we need be. The other thing I'd say is we may well look at playing two rucks as well. That may help.