Kitz checked Niger Ilay, Rosenberg visited Ment (let's look at the votes based on status). Barney probably visited Plesen (surprisingly!). Did the others just shoot and hit their own? Are the unsuccessful NDs displayed? Although Freeman might have checked.
Regarding Koshi and Hos, based on the description, they seem like aliens. One was swimming somewhere, and the other had a small body. Is that right? Humans killed Hos, and other mutants killed Koshi. Correct me if I'm wrong. I'm not very familiar with HL.