He also wanted his reliable retainers as his secret agents, who had worked for his family for generations, because he was a shogun from the Kishu family, a branch family of the shogun family.
また、傍流の紀州家から将軍家を継いだ吉宗が、代々自分の家に仕えてきて信頼のおける者を間諜に用いようとしたことも理由としてあげられる。