Did you notice this?

[Mercen-X]

Nope, you're still wrong . . . lol.

I'm assuming that means "sorry for thinking you were wrong & thank you for providing proof that you were right".

No. It just means I like to say "you're wrong." lol

hmm. people seem pretty desperate to find plot-holes for AC.

Lets be honest, there were plot holes in FFVII big enough to fly the highwind through.

As for AC... the story wasn't so much written and thought out, as it was just thrown in there as an excuse for FFVII fan service.

Agreed.

Syn. The three brothers Kabaj, Lozer, and Yahoo were the mimetic legacy of Selferode who was, in turn, the genetic legacy of the Jenoone creature. He may have been Lucrecia's son but he was a half-mortal as well and chose to acknowledge the greater power within his DNA.

Syn. Geostigma existed before Advent Children in the game. It simply had a different effect and name (if any, I can't think). The Jenova cells that were placed in potential clones by Professor Hojo showed their effects as soon as you left Aerith's house and visited that guy in the Slums with the # on his head. Geostigma began as Jenova cells trying to infect and corrupt the body in order to draw vessels of Lifestream energy to a singular focal point (Hojo believed to be the Promised Land), where they would then be combined to reassembled the decimated Jenova. Over the course of the game, we encounter four different Jenova's all representing only a small part of it. Synthesis was probably the closest it came to being complete though I imagine Perfect Jenova would have been much bigger.
I would daresay Bizarro Sephiroth isn't even Sephiroth at all. It's just another form which Jenova took though it began as a clone of Sephiroth containing his mentality. Despite having Jenova's cells, I doubt he'd be able to transform as monumentally as the game would have us believe early on. Even having corrupted himself entirely with Jenova cells, Hojo could only manage a transformation into a Jenova duplicate that amounted to a finger. However, I fully believe Sephiroth's final Savior form.
That was a meaningless rant. Tangent. Anyway, Geostigma has started to hurt people because the Lifestream has become aware of Jenova's threat. Just like how the Planet created the WEAPONs to protect it, it's own inner defense system begins to affect the living creatures who are affected by Jenova.