Ok so this is less of a theory and more of a crazy thought that appeared while I was going through the forums but hear me out. What if Kairi's Grandmother is Master Ava. She seems to have a large amount of knowledge of the keyblade war and the existence of other worlds and how they became separated. it would also make sense from a story perspective and honestly seems like something Nourma would do to make Kairi more relevant to the story.

I've believed that Master Ava is Kairi's grandmother for a long time, ever since we got that update when Master Ava first spoke.

 

The way she acts and what she wishes for the dandelions is very similar to Kairi's grandmother's story. Not only that, but I once translated Ava through multiple website, just to be sure, and not only does it mean folk/fairy tale (like the story), but it literally also translates to, and I'm not kidding, grandmother.

Ok so this is less of a theory and more of a crazy thought that appeared while I was going through the forums but hear me out. What if Kairi's Grandmother is Master Ava. She seems to have a large amount of knowledge of the keyblade war and the existence of other worlds and how they became separated. it would also make sense from a story perspective and honestly seems like something Nourma would do to make Kairi more relevant to the story.

I've had this theory for a while, but it's to lose now.

The only problem i see is the time... i mean she must be very very old then^^But i think it may not be totally impossible

There is a slight chance that it is, but the thing about the war is everyone who was fighting for the light died. And it doesnt seem like Ava is going with her dandelions. But Even if she did somehow survive, she wouldnt have lived that long. I believe Kairi's Grandma is older than Xehanort, but there is no way she could possibly be that old. If the war happened within the last century it wouldnt just be called a story.