I’ve been having a bit of fun kicking around this theory in my head.
For starters, a quick overview of the similarities between the lifestream and Jenova:
- Too much exposure to either can turn a being into a monster
- Memories are an important aspect of both (the lifestream contains all memories, Jenova manipulates memories)
- Both travel the universe for survival (the lifestream travels through Omega to maintain an interplanetary cycle of life, Jenova is an alien virus that arrived on a meteorite)
Considering these similarities, it has been my (and maybe other’s) headcanon since the Compilation days that Jenova is some type of twisted Minerva/Omega from another planet. Let's just roll with that for now.
This headcanon answers "what" Jenova is, but not the "how" (i.e. how did this other planet’s lifestream become twisted?) Enter the Whispers. Their job is to ensure destiny stays its course. But what happens if the Whispers fail? What happens if a planet is no longer able to prevent its course from diverging, intersecting, or overwriting itself? (e.g. whatever is going on in Remake’s Zack scenes) My theory is that the defeat of the Whispers will result in the lifestream fluxing uncontrollably. Without the Whispers at the reins, perhaps the lifestream spirals violently out of control, which is maybe the origin of Jenova?
What I'm trying to say is that Jenova could be the unfortunate lifestream of a previous planet that defied its fate. A "twisted Minerva” if you will that hijacked Omega’s ability to sail the cosmos.
So where could this go? I often think about Sephiroth's offer to Cloud at the end of Remake to join forces and defy fate. Just bear with me for a moment: let's say Sephiroth is aware of a higher power. Let's name this higher power Destiny (with a capital D). Destiny is a cosmic being that watches over all the lifestream in the universe. It equips every planet with Whispers, a type of Weapon that tries to prevent cases like Jenova. Sephiroth, heir to Jenova's legacy, doesn't like this. He seeks Cloud's help to defeat Destiny (promising that Aerith's fate can be altered or something).
Cloud and Sephiroth join forces at the climax of the remake project. Together they defeat Destiny. However, this is Sephiroth we're talking about, he fancies himself at the throne where Destiny once sat. The party is quick to react and kick his ass. With this victory the universe is utterly rid of Jenova's influence. The end.
I think this plot would be in-line thematically with what we've been given so far in Remake. Also, escalating the stakes to the point you're fighting a literal god is definitely a direction I can see this project going (see also: the FF13 trilogy).