With Aerith in the Lifestream purifying all the Jenova cells, i doubt it. And don't argue with Forsaken Lover about Sephiroth, is useless.
SPOILERS TO FFVIA, IF YOU DIDN'T PLAY YET, DON'T READ IT.
Sephiroth: Tell me Ghestal, why you give the position of General to a moron like Kefka?
Kefka: Shut up Sephiroth! Your son of a submariner!!
Sephiroth: Son of a Sandworm you mean.
Kefka: What?
Sephiroth: No one told you? "Son of a submariner" was retconned. You lost one of your most famous lines, Ha ha ha ha ha!
Kefka: Shut up bi**h! I hate hate hate hate hate hate hate you!
Sephiroth: Not anymore.
Kefka: What!? Don't tell me that...
Sephiroth: Yes, that was retconned too.
Kefka: Grrrr, look who is talking! Your retarded Compilation is full of retconns too!!
Sephiroth: A retconn where i decided my own destiny by jumping in the Lifestream, and a retconn where i laugh in the Lifestream before disapearing, and coming back two years later. My retconns only made me more badass than before. Your retconns proved how a moron you are, Ha ha ha ha!
Kefka: You fool! I became a god! A god!!
Sephiroth: And i surpassed death, coming back three diferent times, was corrupting and gaining controll over the Lifestream, and was even capable of creating life with my will and the the power of the Tainted Lifestream. This is being a god, Cefka.
Kefka: My name is Kefka your moron!
Sephiroth: To the retarded members of your cult, your name now is Cefka.
Kefka: What?! Grrrr, Retconns, retconns! I hate hate hate hate retconns!
Sephiroth: Oh no, you don't "hate hate hate" anything anymore because...
Kefka: Shut up!