I was just saying that the PROPER pluralization of Seraph is Seraphim, but I wasn't sure if Xenogears used the term. (SPOILER)And I don't really hold with the Jenova theory - I'd say they're a symbiotic being, and trying to differentiate between the two is rather pointless. The thing you follow through the first half of the game shows traits of both characters.

Meteor would have caused widespread death and destruction had it not been stopped. That was a merely a side effect, but still.