If they add Ivalician Moogles to FFXIV, there's a perfect setup for their existence.

[Shallot_Liltian]

If they introduce Ivalician Moogles as a race in the future, they can justify their existence by explaining that the legend of Good King Moggle Mog descending from the heavens was a tale distorted over the centuries.

It was actually a faction of Pommed Loporrits that left the moon for the surface in the distant past. Modern moogles are branch descendants of these Pommed Loporrits.

Many of these Pommed Lopporits would settle in Ivalice and go on to use their advanced knowledge of technology (and obsession with prime numbers) to construct much of the technology found in Goug.