It's a nice touch to have a Dorobou (Thief) role added into the game, though I was curious what you need to steal. When I saw 05:00 - 05:22, I thought that you just kill and not steal anything. But when it reached 08:12, I understood. The Thief steals the identity of the person he killed. Since Mintosu-san was a Lookout, Siruko-san stole it for himself and confused the others.