Indamiddle, I very much doubt that will be how it happens. Evans' move from CFO to CEO of International and now to Jetstar says to me very much that he is being primed to take over from AJ. He was the architect of Transformation, and now provided he doesn't f**k up at JQ, will give him experience to both major flying businesses.
JH got something of a demotion going from JQ to Loyalty, and obviously saw it as the prime time to look to greener pastures.