[q=POD]That was Sephiroth containing Holy, not Jenova. Bugenhagen reveals in Disc II in the City of the Ancients that it is Sephiroth getting the way of Holy, not Jenova. Play the part again if you don't believe it.[/q] In the interests of playing devil's advocate, I should point out that everyone in the game believed Sephiroth was behind everything. Jenova was never really a big deal for most of them, just some mean old research specimen trying to wreak havoc.[q=POD]Another piece of evidence against Jenova being the catalyst for... well... most things:

Godo says in Wutai he himself started the war against Shinra. Do Yuffie's quest if you don't believe me. He started it for his own selfish purposes. Now, he couldn't have been influenced by Jenova, because he never met Jenova, or rather, Jenova never met him. In addition, he has no Jenova cells. Jenova never met Tifa; Jenova's cells aren't in Tifa, therefore Jenova could not and did not alter Tifa's memories. (This is a conclusion drawn from earlier direct evidence.) Therefore, the same applies for Godo. So Jenova couldn't have been behind the war if Godo was.[/q]Actually, Jenova's powers of illusion can extend to those who aren't infected with her cells. The Cetra was deceived and manipulated; the entire party was brought into Sephiroth's illusion of Nibelheim at the Whirlwind Maze... Jenova's powers are far-reaching, just no so potent against those who don't carry her cells. Yet I digress.

I agree that your evidence does support the view that Sephiroth is one bad dude, in terms of his actions.