Note too the age of the A330s returning to QF. Starting to reach the age where they become more maintenance intensive and thus require more $$$ to upkeep and less efficient to operate.
Note too that the original plan was the same for the 787s. J* operate them from new and then we start getting them (although that may be now the never never) when they're a few years old and again, closer to needing major maintenance.
Sacrificing the mainline carrier on the altar of the LCC.