I no longer believe it's an alien invasion (in the traditional sense). Hear me out!
My theory of the barnacle origin based on the currently known facts:
Barnacles are exeptionally common around the crashed Anaconda on Pleiades Sector bla bla (see Post 2). I think it is currently safe to assume, that this Anaconda may be the origin of the barnacles in the Pleiades. I believe this Anaconda was on a mission in a currently unknown region probably for exploration (or, if you like for a secret military conspiracy reason). It found something, maybe barnacles or maybe something else, which infected the ship and due to system failure caused the crash of that ship.
The barnacles spread on that planet and somehow they developed the unknown artifacts to spawn and spread around the nearby systems as well. The rest is history. (UAs gather information, UAs are found, "The Virus" affects ships systems and stations)
I believe we are not neccesarrily fighting an intentional invasion, but more a form of galactic desease. It's a lifeform that is unknown to humans in that scale and more spreading out of instinc than contiousness.
If it's the Anaconda the source of all UA's then why the UA's are poiting at Merope, not the Conda's system ? There's gotta be something more there. My bet is a larger construction, a UA breeder-factory of some kind. Could be not seeable as POI just as barnacles . It could be transported on Conda but got to Merope somehow. Don't get distracted
Ofc it all could be just logic fails of the plot and the programming. I mean if some systems were permit-only, FD was creating'n'testing something there, right? They bought themselves some time while we were searching on Merope, since the UA's pointing was the only real clue.
They built the HYPE, finished work on the plot continuation, then added the Conda with the GalNet news. Finding barnacle on Merope triggered this news and spawned the Conda. So, there's the question, did the UA point at Merope just to trigger the continuation, or is there still something big to be found?