There are no evidences telling us there is a poisoner. All day deaths have been immidiate and a poisoner usually poisons the victim at night and they die next night. This way there will be time for a doctor to heal the player. So, if anything don’t call it a poisoner.
However, you could think that there is a mafia role that has the ability to choose a player which will die the day after. The problem with this is that the times Aqua and Oog died seemed to either be set or happened immidietly as someone chose to perform the kill. For example, if one of the mafia members visited Aqua, then why would Notty seem to know when the kill was happening, and said so immidiatly. That’s why I think that this was most likely caused by either a mafia role which can kill at day, or a gun (but nothing seems to be supporting this theory yet).
I might be missing something, but what proofs do we really have against Erik?
And if stopping Erik is what you want to do, why not just block him?
What you don’t see is that from our perspective we don’t know that you are town. It’s obvious for you if you are town that Erik is evil, but we can’t just take your word for it, and you could just as well as Erik get lynched. It will basically be a 50-50. However, by lynching mul, who happens to be a very likely mafia, we can easy figure out which one of you that are lying, and lynch him next day, without having to risk lynching the PR.