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Firstly, I didn't insist on Del's execution. Her contribution is minimal, and the single post she made can be interpreted in different ways. In my opinion, Kosha exhibits more mafia-like behavior compared to her. Kosha wrote more and made some unpleasant remarks. Sab said he suspects her role, but didn't specify what that role is, and for me, it's not at all obvious. If someone points out that I'm wrong, I will, of course, withdraw the accusations, but for now, I don't see any reason why Kosha could be a town member.
Also, their positions, especially Kosha's, are interesting. She writes very little, says not to bother her, there's no analysis, nothing useful, and she appeared late (institute - not institute, usually appears much earlier). It gives the impression that she was already mentally prepared for her execution and doesn't really care, because she's a baron's DD.
In general, Del also seems to be playing a passive role, but she's not very active in life, so I'm less sure about her. Although, the possibility that they are all mafia cannot be ruled out.