Wasn't one of the stumbling blocks (QF basing) the efficiencies of the rostering system.
One of the major efficencies was to maximise the utilisation of the crew based in Singapore.
Management wanted to pre-allocate rosters (no bidding) & AIPA wouldn't budge on seniority style bidding for rosters & days off.
Seems to me, they couldn't achieve it in mainline, so are attempting the same with J*.