Well, I think we're all forgetting a few possibilities: Maniac had claimed cop, and only krellin knew for sure that it was a fake. Krellin had previously claimed a power role, if the initial claim to stop his lynch was true, and Maniac's claim was true, then I think it's possible that whoever killed krellin thought he was doctor, not cop. I think this lends credence to the possibility that krellin was roleblocked, but unless we get a claim, and it doesn't look like we are, then it's clear that one of either krellin or ghug was RB'd.
Lizards would probably only RB ghug if he were aiming at them, while lizards might RB their kill target to a) ensure it got through against a doc self-save b) possibly claim RB for themselves c) block a kill action or d) to clear fewer townies.
@maniac: What I meant to say in the post that got cut off was, "Maniac, you're trying to say that your whole plan was to draw the fire of the scum off of the town power roles and onto yourself? You do realize that it's also going to draw the fire of the town too, right? Regardless, you look like scum now, and there's not much you can do about it at this point. (Additional side note, the mutant could afford to draw fire like this because it wouldn't kill him.)
Also, @maniac, if you're convinced that PJ is very likely to be mutant, why are you voting for guak? Sure, if he IS the lizard, then it makes sense to take out the lizard first, and deal with the already-caught mutant next, but if he's NOT the lizard, then we're put in an awful position because you didn't want to kill someone who stands out pretty clearly as scum. Unless you're one of those scum trying to get that position, your stance doesn't make much sense to me.
It's pretty clear to me that either PJ or Maniac is the mutant. I'm leaning more on PJ because of the potential of ghug shooting him, but Maniac's posts aren't convincing me that he's not the mutant either.