How long is this going to be? You see him quelling revolt in Paris during the revolution, his campaign in Egypt, his coup, various battles against European's I'm assuming before and after said coup, and throw in some romance too. And of course if you want to tell the full story you have to move to the disastrous invasion of Russia followed by being defeated by the British.
Just a lot of historical events to tick off for a movie.
I think it will be a figurative "prequel". No invasion of Russia, Elba or Waterloo, more the rise to power.
Probably a wise decision storytelling wise. You could make a whole 5 season show out of the Napolean story.
I like a story I heard by William Goldman (writer of Princess Bride, All the President's Men, etc.) He was working with Richard Attenborough on the Downey Jr. Chaplin, who had a dream that the movie would end with Chaplin returning to US and getting his lifetime achievement at the Oscars. Goldman told him bruh how you are going to tell 80 years of events in one movie. Goldman said his idea was to make it so the last scene of the movie is Chaplin becoming the tramp and concentrate the story on his early life and relationship with his mom who was a vaudeville performer who was put in an asylum at one point. Attenborough went with his original version which is 60% on RT and mostly remembered for Downey Jr performance.
As a recent example I think Elvis is better if they just started it in Vegas. I don't need the 5 minute montage of Colonel Parker saying "we wentz to Hollywood and made lotz of money!" and giving almost no time to meeting Priscilla. The whole theme the movie of managers exploiting artists is all there in Vegas arc.