Or you're recruited.

What's the player count right now?
11-5 if noone was recruited and 10-6 if someone was recruited, right? We should count it 10-6, since the Gs can easily recruit, even if they haven't by now. That's a lost game for the civilians. They can only make one mistake, only one, and they must be right at least 6 times in 7 days in order to win. Practically impossible, even with a much better set of civilians.
Since we have only 1 right to miss, we simply must do the following: Lynch ALC today. If we're wrong, then the Gs are those who sacrificed Janna, so we go after Fred tomorrow. We just don't have more clues. The clues from day 1 are the strongest. Experimenting won't take us anywhere. If we kill Sheik and he turns out to be a C, we won't learn anything.
