I'm enjoying this show so far. I'm a major fan of the
Invasion of the Body Snatchers films and I will basically watch anything that's like it. I even read Stephen King's
Dreamcatcher though it was pretty retarded (especially the film version).
The virus doesn't have to have a central intelligence but instead it could be just an equivalent to the "interstellar kudzu" that was the byrus in
Dreamcatcher and the "pod people" in
Invaders. The goal for both of these life forms is simply to spread as far and wide as possible. The biology of the pod people from
Invaders is explained a little more in the book, but basically they have rather short lifespans and whatever knowledge they gain from their hosts is purely utilitarian. They take over a planet, consume all of the resources and then spread to a new one.
The idea that the virus is a weapon designed to clear a planet for invasion is another good one, as that would be a much more efficient way to invade, provided that you could make a virus that works on alien biology.
Personally, I believe the aliens from Kepler are all hosts. Either they created the virus and fucked up big time, or they also fell victim to the signal.
It has no problem stocking her with drugs like morphine and alcohol and knows if there's no way to convert her, they'll just drink her to death or do some other crap like put her in danger by the wolves and so on.
This is basically what the aliens do to Gard in
The Tommyknockers. The metal plate in his head significantly slows down his transformation into one of them but he's still helping them due to the love he has for his friend. They have plans to kill him if his "becoming" fails to work quickly enough, but they decide to keep him around and keep him drunk all the time since he didn't seem to be interfering with their plans to dig up their ship.
The aliens in all three of these other examples are all essentially unable to build truly interesting and advanced civilizations because they are parasites. Even the Tommyknockers, for all of their technological knowledge, didn't know how anything really worked and just sort of fumbled their way across the galaxy. They also didn't care too much about how many of them died during the process.
Humanity #1!