Amon not the only FFIII character making an appearance?

[Kerrigen]

I don't think it's a coincidence at all - looks like another reference to FFIII.

"An enormous, vast, gigantic, underground tower! Do you not see? <sigh> Of course you don't... It could only be the lost tomb of Xandes─the first emperor of Allag of whom I spoke mere moments ago. But wait, there it more to tell! You see, it is impossible that a normal building, however large, could release so much ethereal energy. An immense crystal on the other hand─that most certainly could."

Aye, it happened. The Crypt of Xandes I lies in the depths of Silvertear Falls. What you saw took place there, when van Darnus finally tracked me down. I thought myself as good as dead.