If those of you with white crystals aren't of any use to Garland, you can be sure you're of use for Kalki's plan. Becoming God or whatever that megalomaniac witch thought up.

[ Cid looked at the Crystals of the Heroes, but evidently had no clue about them. ]

She's about as twisted as they get, so don't go thinking she made you any favor. Beyond that, afraid I don't have a clue.