If Fukai-no-Joten/ Fukaijoten is a direct line imperial succession code or a legitimate child imperial succession code, it conflicts with the facts because the code was broken only a few days before or after the enthronement.
もし不改常典が直系・嫡系継承法なら、この法は即位の数日前や後に破られたことになり、矛盾をきたす。