Quote Originally Posted by Red Mage Coffman View Post
This is just a tiny theory my friends and I threw together, whether its true, I have no clue. If you've played Crisis Core, near the end of the game, two Soldiers come and pick up Genesis, muttering some random crap that has slipped my mind. We always thought that Kadaj, Loz, and Yazoo were Genesis, and those other two soldiers. We don't know for sure though. It was just a thought.
Those 2 soldiers are Weiss and Nero from Dirge of Cerberus.

The remnants are explained a bit in Case of Lifestream, and a bit further in Lateral Biography
Case of Lifestream - YouTube

The remnants are more like the way Jenova conjured Sephiroth in FF7. Originally it was just Kadaj, but he wasn't enough, so Loz and Yazoo were created.