There is clearly something going on behind the scenes that investigators can find out (By investigation victory conditions). I can't say much to that as of now, however I think it plays more into "the game ends on day 7-8" thing. I think if we kill the assassins before that day, the game ends either way. However, if we can't figure out the assassins, I think there is another way to win related to the GM and the hints. Again, this is just speculation on my part and not really backed by much fact.