Okay, this is not going well. We need to get on top of this, and we need to do it fast. I agree with Cal, I think first priority should be sorting out the missed lynching of omg. That should start with some answers. I understand there were reservations, but we had a chance for two lynches and instead we got none.
Secondly, we need to find out how ML avoided that lynch, and whether he did it or someone did it for him. mafiascum says Jailkeeper can block any form of kill, but our Jailkeeper (Fred) didn't seem very sympathetic to ML, so I can't see why he would protect him. So if anyone knows any role that can explain this?
I think we also need to examine those that were attacking kesty so vigorously, too. Not necessarily those who were suspicious, but those that were sure.
Finally, there is what ML said about the postman theory being wrong. Do we take this to mean the postman is that second possibility, the sending a message and getting one back thing? Furthermore, it means we have a second kill, and there are few things that can do that, and do it consistently. I think we need to strongly consider the possibility of a SK. It does seem a bit strange that this SK, if there is one, has nailed two townies in two night, possibly even two power roles, but it is always possible that that is pure luck or that this game is full of power roles.
If I had to guess at the identity of an SK now, without any real discussion on it, I'd have to point at omg. His purely neutral story is a nice distraction, causing us all to argue over whether he should be lynched or not instead of whether he is telling the truth or not. Furthermore, investigation from our (now fallen) Cop would simply say neutral, which would serve to back up his story. And he knows good and well that if we didn't Vote2 lynch him at first chance we won't be able to, and we will be too focused on hunting scum to V1 lynch him, so he is relatively safe as long as he lays low. Basically, it boils down to the old "hiding in plain sight" cliche.
So, I think at this point we string up omg at all cost. Even if he isn't an SK or some similar town-killer, he is the only person we know for sure to be non-town, and with 4 down we have to lynch someone.