In fact, as the most convincing theory, it is said that ten men met and complained to him one by one in order, and after having listened to them, Umayado no Miko gave them proper advice respectively, which proves his sound memory.
しかし実際には、10人が太子に順番に相談し、そして10人全ての話を聞いた後それぞれに的確な助言を残した、つまり記憶力が優れていた、という説が有力である。