Shiro and Kido...dont really work. so i dont think Gio would have to compete against Shiro for the title of Grand Kido Chief. I'm not sure about Kurisu though, or Kaizo. I mentioned shiro for the sake of comparison in titles. Kenpachi is the highest zanjutsu title, flashmaster is the highest Hoho title, and Grand kido chief is the highest Kido title. hmm there isnt one for hakuda.