Here's a bit of interesting trivia
The valefor in LoTA is actually a recycled dragon from Final Fantasy XI.
The Valefor you see in LoTA is not based on Final Fantasy X's valefor but rather the one from Final Fantasy III.
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I don't think any monsters in Crystal Tower with the exception of bosses looked like their FFIII counterparts. Most of the enemies in the raid dungeon were pulled from XI and given their names from FFIII.
Don't know why that is but you've had until like 3.5 to get used to what this game does and how it's pretty much a MMO literred with fan service for FF fans and I don't think Yoshida is going to stop with the fanservice because a few WoW refugees chose to come and play a fanservice game intended for a specific audience.