Quote Originally Posted by VeloZer0 View Post
Yeah, but isn't it just someone from in game saying it? I mean, they have no way of knowing for sure either. And if memory serves me correctly it was Hojo, who I don't necessarily label as a credible source. (Or at least a trustworthy one.)
Hojo fully discovered the phenomenon of Reunion and it was 100% verified when he arrived at the crater. He himself said he was wrong first but corrected everything then. Hojo is, despite Sephiroth hating him, the scientist who fully understood the nature of JENOVA as he stole Gast's documents and found out what Gast did not know.

When a moment of enlightenment in the game itself is not credible you may not trust a single line in the entire game. Or to say it better, all answers lie in the game, as Tetsuya Nomura said.