Quote Originally Posted by Saikou View Post
...all allusions to other FF titles are just that: Allusions. Homages. References. A wink and a nod.
While this is mostly true, I think the introduction of XI's Shantotto and XIII's Lightning show that travel between the void to and from Hydaelyn is not only possible, but somewhat probable given enough time. I think because of that, while Hydaelyn is obviously separate, the naming influence could be, in some cases, more than just allusion.