if you want to be 100% sure then it is snivy because snivy has 3 clues against him. if you want the most beneficial choice (win big, lose big) then ethan because he is likely the packless one (along with the other suspect that is krem but i talked to krem, he was there when the hosts clarified the butcher thing but he didnt try anything malicious so it is likely ethan) and the packless one is wolf investigator. we will win big