Wrong argument. Home leave is not for people who have yet to relocate, it is for people who already have relocated.
For people who have yet to relocate, there is the Installation Allowance, ie one month salary bonus. Then there is the Expatriate Allowance, from 16% to 20% of the basic monthly allowance.
Then there is the possibility of Rent Allowance, meaning that you get your pay plus bonuses and don't have to pay your rent either.
And there's all the rest, which you obviously have not read.
Nice job if you can it, any way you look at it. Well, it'll be nice as soon as Batistelli moves out.