Spoiler question re The Scourge

Thanks for the info!

I had a thought last time, maybe Jardaan were a faction of pre-Angara and other faction was also, but their methods differed too much and they got into disagreement which burst out a fight?

Yep also thought about memory transfer, but slowly opening via artefacts or key places, words etc. Would the Angara be actually Jardaan but for some reason, the memory opens up very slowly.. hah just a random thought

The fact that the enemy is unnamed/faceless makes me think we are dealing with two factions of the same species/group. It's also notable that the enemy learned what the Jardaan were doing from someone according to SAM.

This make it sound like group A was working on the Heleus project with group B, but A wasn't telling everything to B and once B learned about something, they tried to stop whatever A was doing but an accident (caused by sabotage/terrorism) happened which resulted in the Scourge. Then everyone left the polluted lab (cluster) behind instead of trying to clean up.

The fact that the project wasn't based on a planet but a Dyson sphere and that they left everything behind suggest to me that the Jardaan were probably not native to Heleus.

Also, with the vaults and Meridian pretty much functional before the Scourge happened, I don't think it was those that caused the conflict...unless group B was in another part of the galaxy and group A had the time to finish things up before they reached the Heleus cluster.

I don't think the Ketts have anything to do with the Jardaan, unless they are another abandoned pet project.

I don't think the Reapers are involved:
A ) there is a lack "plug&play" tech meant to drive tech evolution like in the Milky Way. Which means a lack of tech to indoctrinates people too.
B ) I actually don't think they would care about the Heleus lab project. The Protheans played a lot with evolution too and nothing changed to the reaping schedule because of it.
C ) The incident that created the Scourge happened around a thousand of years after the Jardaan seeded the Angara in the cluster (around 1600 CE). The Reapers are usually swift to deal with "issues".

I've went back after writing that post to do some reading because it's been a while I played the later section of MEA and I forgot a few things. The enemy is referred to as opposition which according to SAM could also translate to defiler. The conflict is hinted at being ideological in nature with those terms. But with the time difference between the seeding of the Angara and the Scourge showing up I don't think the issue was with Meridan/Vault systems itself which had been up for a long time before the Scourge happened (and Habitat 7 seems to be one of the last place they terraformed).

Something probably changed in the project eventually. They did start to study the Angara like lab rats at some point (or at least someone did) which doesn't really match the religious undertone given to the "great work" in other Remnant writings in the game.

As for the Jardaan being the Geth, it's impossible unless they found a time machine. The Geth War happened in 1895 CE, the Heleus cluster already had Angara for a few century already. I do not discount the Jardaan being synthetics or hybrids or energy beings though. I don't think they were humanoids, their communication interface doesn't fit with that. My favorite idea is that the floating Remnant robot is based on their look: so I'm going with bioelectrical medusa. 

All ew know is that it appears that Khi Tesira was struck first by the Scourge and that it spread from there. It is presumed to be a weapon based on wha twe find during the las tpart of the game though we don't know any moer than that. The rest is just speculation really though I'm lookin gforward t olearning and hearing moer assuming we ge tmoer stories in this MEA galaxy.