I suppose the aliens and humans are similar in cognition, but it seems humans have more emotion. Will that be enough for humans to fight back and win?
Kind of sad that no one can be revived again, but then, if they were already dead, how were they being revived in the first place, and what are they once revived? Are they truly human again? I think that I won't be getting any answers which is a frustrating aspect of this manga. Cool battle scenes but explain something for once!!