I've heard a few shipper rumblings that ACC doesn't replace AC in canon, so that even though Aerith wasn't seen in the flowerfields in ACC's end credits, it's still considered canon that she's there. Or something.
I guess I'm too logical (see avatar), but if the creative team chooses to either a) delete something or b) add exposition, I stop and ask myself why they made that change, what their motive was. I would never write off said change as meaningless.
To say nothing of it not making sense.
I mean, the details of Han shooting second is generally disregarded to being the fakest thing ever (bodies don't move like that.), but he still shoots second and the latest version of ANH still counts til Lucas says no.
And I'm with the Hitobito. The 'Complete' version with all the things the makers wanted to change/improve from the original now in it does not count?
Of course, then there are the folks who want it both ways. ACC counts... except when AC does. That's mostly just WRT second credits, though. A few have admitted ACC counts, and that it punches their theories straight in their delicate internal bits, and are looking elsewhere for their symborism.