Don't really know enough as I mentioned, only know the characters for the number from playing Mahjong. Either way with the answers in our hands it still feels like a pretty lame cover name.
Sure Tatsuya may not be as universally talented as Miyuki but he's at the top of every written test, so if they still have the whole posting up grades thing he'll get more well known in another way. And Miyuki is in the top for the practical part, so they're dominating the two parts where you get graded. But yeah seeing as most generic students are lacking in common sense it might have never hit them to question anything. Even though what Kraco said makes a lot of sense it still feels weird because the ten families should know each other, but Jyumonji didn't seem to know anything about Tatsuya or he has a really good poker face.