Мафия 68. The Witcher II

I would have Sesham executed. Not based on evidence.
On the first day, Vespe, Mona, and Sesham were talking. Logically, at least one of them should be a Mafia member. If so, I would primarily suspect Sesham. I don't like her joke, "By the way, are you the Boss or Aretz?".
I also don't like her post saying that autopsies are prohibited, and I won't find anything interesting. Hmm. Let's assume they were allowed. So what? In short, I didn't understand her logic.

1. The Mafia members were talking in the Mafia chat at this time. So, I would bet that none of the three are Mafia.
2. Regarding the Boss - this is not a joke, but a statistical observation: if a number on the draw is popular, then there is a high probability that a Mafia member is under it. And Aretz and Vesp took the numbers 8 and 9 that I was eyeing.
I hope I explained it clearly.
3. If autopsies were allowed at night, I could have hoped for a sincere confession from Aretz or Vespe. But since they are prohibited, I had to wait until morning. Isn't it obvious that this upset me?

Can someone explain to me why the Mafia would block and kill the same person? :confused: Considering that the town doesn't even have a proper archer.
Is it possible that the Mafia blocked, and the Town killed?