Quote Originally Posted by Dragon Mage View Post

It could have done this easily by spreading it's own cells throughout the Lifestream and then making it's own cells attack the host. If you've seen FF7: AC, then this would be similar to Geostigma.
Wrong again:
According to Ifalna, the Ancients infected with the virus lost their sanity and turned into monsters.

Geostigma don't turn people into monsters.
True, it didn't. But then again, there was no direct force/creative mind behind Geostigma, was there? Had there been a being with the ability to control the Jenova cells, and with the inherent mutant powers we know that Jenova cells are capable of, Jenova could effectively turn people into monsters. Who knows what the true powers of Jenova can do. It could probably do more.
What the heck was Kadaj putting into the water that the kids drank? More J-cells? To tilt the scales of power against the body's natural defenses, I could imagine. More importantly, as Crystal said, it was all orchestrated by the will of J-Seph and Kadaj even admits to being a puppet no greater than the kids they used as shields.

By the way, Crystal, "it could have" doesn't sound to me like DM was presenting this theory as fact.

To do this, they first injected members of SOLDIER, an elite fighting group attached to Shinra with Jenova cells, not only to see what effect it would have, but to get the Promised Land sensing ability as well. However, the Jenova cells had little or no effect on the SOLDIERs. This is because the mind and body reacted to the foreign substance and attacked it, destroying the cells before the cells could do anything. In an attempt to get around the body’s defense, the experiment subjects were submerged in Mako. This brought down the body’s defense—for reasons I’ll explain later—and this brought into being the Sephiroth ‘clones’. However, these ‘clones’ did not posses the ability the Shinra were seeking, so an unborn infant was directly injected with Jenova cells, to work in the alien cells with human DNA--truly fusing the two species together. This is the creation of Sephiroth.
Was any of this supposed to have been mentioned somewhere in DoC?

He was being controled by Sephiroth at the moment. Considering the fact Sephiroth was holding the party in the air(while crushing their bodies) before the fight with Bizarro, I don't see why he couldn't make Cloud walk on the "ceiling".
Cloud did manage to levitate and walk on ceilings in the North Crater, yes? I doubt Sephiroth was the one manipulating Cloud, as I do believe he was saving his energy for using the black materia. He had already pushed Cloud's mind to the breaking point, and to handing him the black materia. Cloud did the rest: Sephiroth had comparitively little to do when Hojo confirmed that Cloud had been used as an experiment.
Also, Crystal, that Bizarro was the 'Awakened' Sephiroth. Of course he could manipulate the group. But as DM said, I doubt the dude in the Crystal could have levitated Cloud and allowed him to walk on the ceiling. Besides which, Cloud displays his own ability to levitate objects and otherwise defy gravity many other times in the game and especially in AC.