RP,
That is not the interpretaion as I understand it. If that were so, why would there be the differention between "Designated" days off and "Rostered" days off? Why would they even mention the "Best endevours" re down route days off if days off at home were guarenteed?
I'm happy to be corrected by anyone with better inside knowledge, but if you're right RP, have you thought of applying?