Heh. It was all part of the illusion. Yevon's daughter built up a religion around the thing, telling people they could get rid of Sin if they just atoned for their crimes and sacrificed enough summoners.

[Might be a little bitter about that. Might be why he was initially very suspicious of the summoners' guild.]

The cycle lasted a thousand years, but we finally beat it for good. Unfortunately, we've got less than a year to beat this thing before total annihilation. But the other eidolons might have the answers, I think.