I wouldnt say that JENOVA controlled Sephiroth the whole game... I say Sephiroth is working with Jenova... Why would she make him think she's his mother when she can just control him without having to go thru all that trouble... He's been BORN with J cells so in some way he IS her son... and I think she accepted him as that... The only person that can recreate Sephiroth in the "Area of the WEAPONs" is IMO Jenova... and she plans to create him again... her son. If this wasnt true then there wouldnt be a "half-made" Sephiroth there... and Sephiroth should be running around not saying anything except stuff like, "You are my puppet" or those things Jenova would say.... =P