For some reason I really want to see Roger die. I don't know why though. I'm thinking it's because he didn't secure his wife so she could have a regular birth before his death.
Author isn't sengoku become fleet admiral after Roger execution. so can you make him see his fleet admiral uniform in manga when he haven't become fleet admiral yet.
if he doesnt die then basically the whole story would be pointless i think, unless you are gonna fake his death kinda? also hate harem in this story coz you gave mc a wonderful wife so it`s gonna derail the story off