Ok, I've just awoken the weapons, and am now with Barrett and Tifa about to get executed.

But, some things are confusing me, even though I clocked FFVII before (albeit many moons ago), and I cannot remember how things are going.

But, I wish no spoilers as the game is surprising me with things I didnt remember from last time, ok, so here we go:

I understand that Weapon was created by the planet, to protect and has been dormant waiting for the return of Jenova, but where did Jenova come from? Is it just a natural entity, or was it created in some way?

I understand all about the Jenova Theory, but Sephiroths will is confusing me.

If Sephiroth has been dead in the crater for the last 5 years, is it his will that is bringing the followers to the crater? Or is it Jenova's? Or Jenova acting through the dead Sephiroth?

Who is the Sephiroth that I have been chasing, i.e - at the temple of the ancients if the real Sephiroth is at the North Crater? An illusion that Jenova has created?

Is this the reason you never fight Sephiroth before now, only Jenova, because the Sephiroth you see is just a part of Jenova?

I get about how Cloud is a clone of Sephiroth, and I am guessing was given Zacks memorys (or some of), and that Jenova has created Clouds past inside Tifa's mind, but why are the Jenova followers gathering for a reunion? Is it because through all the experiments, Jenova was infused into people, and they are being summoned to create Jenova once again, at her full power?

If you could please explain these things to me, I would be very grateful!!!!