The guy who was interviewed on the ABC (in Oz) who I saw was Péter Marosszéky.
A little bit more experience than GT, looking at this:
Péter Marosszéky | www.wiseheads.com.au
I recall also seeing Trevor Jensen on the telly discussing the MH disappearance. It would appear that Ch 7 are happy to stick with GT just like AJ is happy to have him speak about QF on his behalf when required.