With the greatest respect, I would imagine that the decision about Borghetti and Joyce was made by the Board on the recommendation of Dixon, and Dixon would never recommend Borghetti.
The reason for this is simple; the Board has "buy in" on Dixons world view. They were sold his strategy, including all the Jetstar and "legacy airline" stuff and they fell for it hook, line and sinker. I'm sure it was most convincing, I'd probably be convinced myself.....
......Except that old Sunfish believes that people are funny animals that often do strange unaccountable things but that respond to decency, fair treatment and a little good leadership. I suspect that Borghetti believes the same as me, or he wouldn't be working for the likes of Richard Branson.
Philosophy is rather important at the top of any organisation. It is all about that "core values" stuff. Business strategy always reflects those core values and all employees have very sensitive bullshyte detecting antennas that immediately detect them. This is why Two different people can say "our people are our greatest asset" one gets applause, the other gets a horse laugh.
The Board simply could not appoint Borghetti without jettisoning everything that Dixon stood for.
Borghettis is now getting the opportunity to prove the superiority of his world view and philosophy over Dixons. He may win, he may lose, or he may be cheated. Time will tell.
As for Joyce? He has no strategic vision at all. He stands for anything and nothing. He is simply Dixons "MiniMe".