Quote Originally Posted by Kyros View Post
I see it as they were simply created in response to anything that would threaten the planets destruction, but it just happens that at the time it was Jenova. Had something/someone else come along by then with the same cataclysmic undertones then they would have been there in response to that. They don't awaken just b/c Jenova's around, they awakened b/c they sensed what trouble Sephiroth was bringing to the planet.
Sephiroth was jenova. It was jenova who made sephiroth appear all over the world and jenova who gives him the power he needs (he manipulates Jenova to gain its power). Therefore, the second crisis of the planet is the REUNION. The reunion is completely to do with jenova as much as it is Sephiroth.

Once the reunion occurs, weapons are released. Both times, it was Jenova who was at the centre of it. The reunion is Jenova.