Fourth Faction?

So, guys, I've got Mars, Venus and the Terran Survivors as broad factions for the game who will all, in due course, get their own special rules as well as suggestions for miniatures that can represent them well.  Each of these is diverse in their own right (factions within factions as the leaders of the various worlds disagree over how to deal with the mysteries and challenges of the Fallen Earth), but I'd like to bring in a fourth faction and I'd love your feedback, dear patrons, on which one you'd like to see...

Here are some details on the options:

The Empire of Mu (All-synthetic faction) - After the Fall, an artificial intelligence residing on a closed network escaped into the residual net and has been learning about the world through the senses of the many abandoned network-enabled drones, remotes and other devices.  With its own incomprehensible agenda, it has assembled a haphazard collection of combat drones and other devices to protect its interests.

The Deepspace Collective - Earth had extensive off-world interests at the time of the Fall: mining facilities, transport fleets, research satellites.  Whilst the number of occupants was only thousands, they were among Earth's most talented disruptors, seeking a fortune in the stars.  They see themselves as the designated protectors and inheritors of the planet, ostensibly uninterested in the missing billions of fellow Terrans, their goal is simply to rebuild the planet's ecosystem and prosperity, with themselves at society's new apex.

The New Economy - The world's economic systems suffered a massive shock from both the Fall and the mass disappearance known as the Vanishing.  But "shock" is not the same as "destruction".  Uncounted trillions of eullars (Earth's common currency) have been snatched up by opportunistic survivors determined that they should still hold value and they will enforce this by any means necessary.

The Men in Grey - Mysterious and enigmatic, the Men in Grey were at first dismissed as imaginary or the result of the awful mental traumas that followed the Fall.  But the sightings have been too many, too consistent, to be dismissed entirely.  Tall, pale people of indeterminate gender, dressed in dark grey uniforms or suits: are they human at all?

Something else entirely? - Have you got an idea for a fourth faction that would fit into the setting of the Fallen Earth?  Let me know.