How/Why are the islands floating in Heavensward + The Aery?

[Kotemon]

The moogles' legend implied that many of the landmasses were a singular continent until they were sundered by fire from the heavens at some vague point in history.

..and it was also around that time they sent a backup colony down that settled in twelves wood. Vundo legend says Bishmark sent the island or landmass into the sky. Acording to Matoya, she and Louisoix often talked about the Allagans sending Azys' La into the sky.


Looking at the topography the Churning mists looks like the top section of the mountain with its peak is in one piece from the forelands. However you can see smaller chunks around it. That suggests the top may be messed up but you never notice it from any location. From the mists the place looks like its barely held together by Spiderman's web shooters. With no real sign that the mountain or its floating section is below it. Coudtop is basically a bunch of separate chunks floating around the hidden research facility. Either they were both one large piece once that drifted apart over time, or the Churning Mists was a separate floating mass from Azys'La. The Vanu Vanu however don't seem to have any tales that follow the Moogles account for the Dragon war breaking up the place. Both locations are considered floating islands within the same area/region and in flying distance.. Cloud top does look like its either deteriorated over time or was steadily being eaten up by Bishmark whenever it appeared. Although one tribe wants it to go away, the other tribe seem to want to feed you to it. Like tossing people into a volcano hoping that'll keep it from erupting and killing everyone. (got to appease the god)

Over all we have is a reason why the mists is messed up from the moogles but not how it got up there or if it was built floating up there after Shiva. An origin to cloudtop from the Vanu Vanu's primitive perspective. The fact it was the Allagans for some reason sent everything up there with the research facility after the nation began collapsing (before or after CT's failure?). The only thing in common is that all the floating land masses have a very large amount of crystals, if not are mostly crystals much like the Floating City of Nym. That might explain the Churning Mists accent into the sky as I'm sure Shiva's story and King Thordan dragon hunt was well-long after Azys'La had gone up into the sky.
Given all the new floating zones I'm just surprised Nym wasn't one. Just look at the area around Iddylsire.