I'm sorry but I would suggest the RAAF has far greater awareness of the capacity of its planes and the airports they are asked to use than those that were not involved in the decision on what to fly into Scone.A C130 with its high flotation landing gear could easily land at Scone airport. You can barely see where one's been on a grass airstrip let alone a paved one. They need 3000 ft fully loaded, Scone's airstrip is 4606 ft.
There's one major "problem" between the two Dessault Falcons they ended up using and the C130.
Can anyone guess what that is
I'm assuming you have a source to demonstrate that the photos above are from the aircraft in use with the RAAF as you are implying?