First off, I don't think that dude is going to show face. He's most likely on a plane already. If he shows it's bad PR and if he doesn't show it's bad PR. They'll choose whichever give the least amount of bad press.
I do however, find it odd that he just so happens to show up in Australia for his sick father right when this starts to happen. My guess, he is coaching everything behind the scenes and the FDS wanted a GB member there to make sure everything was being handled as best as possible and to report back to the others right away. The father is a great reason to try and get out of appearing, just like their lawyer attempted to do. He's most likely be behind the scenes attempting to help since the beginning.
Let's pretend he does show though, how do you think he'll handle it? Will he try and speak with authority like they do in their talks. Talking down to people and slapping them over the head with the bible? Or will he be very sheepish and be at a loss for words? My guess is he's going to try to come of with authority in the beginning, using the bible to make an answer whenever possible. Towards the end though, they will corner him and their true colors will come out, he will be at a loss for words. They've never been on the receiving end of a "judicial committee".
I don't think he's going to show though, I'd be very surprised if he does. If he doesn't show, it will give the impression to the commissioner that they don't take this seriously and that they are trying to wiggle out of this whole thing without caring about the kids. Either way, I don't see this ending nicely.
I'd love to hear your thoughts!