Buster,
You are not much on logic if you think naming the MIDDLE terminal as number 1 is the best way to go.
It has to be in order 1, 2, 3. You can buy books which will help you with this sequence at any childrens book store.
Given that the sequence by convention is from left to right the argument is whether it should be 1, 2, 3 on the road side (i.e. Virgin/Rex terminal No 1) or from airside (Qantas terminal No 1) they obviously went with the latter. Big Deal.