Borg is spot on. QF is going to be carrying a significant excess of crew (which makes the QF books look crap) whilst J* hires crew on crappy conditions but shows a significant saving over the mainline crew. Of course, the 'group' still loses a ****e load of money but hey, as long as the J* 'silo' looks good I guess.
QF would be better off sending the mainline crews to J* for the period the A330 is there rather than train their own crews on it only to then send them onto the 787 shortly afterward. It may 'cost' a bit in the short term but it'll save the 'group' in the long term!
Of course, what would I know- I'm just a mainline pilot!