When faced with different choices, it often reveals one's character. By using carefully designed questions, one can deduce if a person is deceitful, indifferent, or kind.
Professor Frans uses complex questions to capture what kind of personality each person he talks to has, in order to screen for those who might meet the criteria for Dio.
In his view, Dio should be someone who doesn't care about the lives of evildoers but maintains a basic moral line, never involving ordinary people in the events they create.
Even if they are involved, no harm would come to them.
Frans considered this very important information.
However, such information was also explained by his friends as "only the souls of evildoers have power; the souls of ordinary people have none."
This also applied to last week's incident of large-scale souls entering the Different World.
If there's anything wrong with this theory, there isn't really.
