I think the Mafia still has the Boatswain and the Witch left.
Considering the long night, we can assume that Veg or Neyra, or both, were stalling. With Neyra, everything is clear; we've determined she's Mafia, but there's only a slight suspicion on Veg. We won't execute him yet.)
Let's assume Lizard and Slonysh are the Mafia, as the main suspects who are still alive. Although Lizard is unlikely to be Mafia, we need to wait for some evidence. And me, if I'm still a suspect.)
Let's shoot Slonysh with the cannon.