My only issue with Greenacre is that he is too nice a guy. Sometimes you need a coach to almost lose the plot and tell a few home truths but I am unsure if he could do that.
Where I see part of Rudan's success is in driving a no excuses culture. Apart from that home Glory game, where he rightly got stuck into the officials - I don't remember him ever really criticising the reffing. Near the end Merrick breed a 'weak culture' constantly lamenting the referees, travel, world is against us blah blah. Achieves absolutely nothing, it's an Aussie comp, and they just don't care if the poor Nix people get upset.
As Rudan said when he first arrived, the Nix were seen as weak lot mentally across the Tasman. He has from time to time, moaned a bit about the travel/scheduling (mostly about the 'home' game at Campbeltown which was in hindsight a Welnix mistake), but mostly he's just tried to 'harden' the place up somewhat. Going back to that infamous Army exercise camp.
Any new coaching setup needs to continue that. That doesn't necessary have to be driven by the head coach (agree just can't see Greenacre in that tough guy role). Paul Gothard (GK coach) at least outwardly, seems suited to the bad cop/hair dryer treatment dressing room job!
Also I'd expect someone like Steven Taylor to set high standards, and not tolerate any slacking off. Before Dura carried a lot of that burden almost solo, not anymore.
However I think Welnix will take a lot of guidance from Rudan. So if he recommends Vidmar, then I reckon he's the favourite.