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Read it. First drafts. I won't repeat what Jack said, but overall, he makes normal and correct points.
Gwen could have been either Mafia or Town. The fact that he was killed by a Mafia member gives some hope.
Zak and Amko were most likely both Town. Why? Zak's note.
1. He could have been a Doctor and healed Amko on the first night. But he didn't say anything about it because he wasn't sure if the Mafia wasn't blocked. But there's a catch... now, after Amko's death, only a Mafia member would talk about his innocence. Would he need to do that? So, this theory is probably not correct.
2. Second, he was watching Amko and saw who killed him. But I don't know if he gets information about the specific role of the killer at that time. But... there's another catch - Amko could have been a Mafia member killed by a Mafia member, or vice versa. So, the information isn't 100% certain.
3. Zak was a Cop and knew for sure that Amko was Town. He gave the information in case of his death, but it turned out that both were killed.