The positions were accurate for the AAMI game and yes, the team sheets are in essence meaningless once the game starts, but if Xerri is there as the on-ball ruck I think he'd start the CBA.
I don't know why we would try a game plan twice in the preseason only to completely throw it out come round one (unless it was dreadful, which it wasn't). So if Noble sticks to his guns we should hopefully see Xerri ruck 60-70% with Goldy the rest.
And CCJ should stay parked 20m out, directly in front, with instructions to go nowhere near any ruck contests (please oh please!)