Illusion,
I totally agree with your entire post.
As J* costs go up, aligning more closely with mainline the less likely they are to get the new jets anyway!
So no problem with parking jets, there's another entity available to crew them.
I believe the 1st 15 * B787 are still going to Jetstar (at present).
But execs are awaiting the numbers on the mainline / subsidiary cost/yield analysis.
Dont expect to hear any announcements till after mainline EBA8 goes thru