Mafia 93. In the Name of the Moon! ☾

But why couldn't Tox, using only in-game information, figure out that Shadow was Usagi?

Yashchur, you can see how Tox plays. And you might have noticed that he didn't even read the role cards and kept forgetting the basic characteristics of the roles until the very end. Of course, Tox could have figured it out based on in-game information and the power of his intellect lol, but I personally don't believe it, and that's all. I'm not trying to convince anyone of my opinion or demand any sanctions against Tox. I would even say - "let it be on his conscience," but I don't believe in Tox's conscience.