I mean does a ninja have to go through the ranks of being a Genin, a Chūnin, a Jōnin and then finally a Kage?
In the movie Road to Ninja Naruto asks Iruka to fill his Jōnin form but Iruka refuses it saying that Naruto will have to be a Chūnin to fill out the application form of Jōnin. But when Naruto became Hokage he still has to be a Genin right? If thats a case can any of the a Genin, a Chūnin, a Jōnin become a Kage?