all I'm trying to say is that Sephiroth had complete control of Jenova's will and made it leave ShinRa building. Just like, IF Jenova was in control, then why did it change into Sephiroth when it would know by the original Sephiroth that he was thought dead by Cloud? It would be pointless to change into someone who is thought dead. Plus, Cloud himself says that only one PERSON had that srong of a WILL, and that it was Sephiroth!