Most mangeka's should just write a basic outline of where they would like the story to end, like JK rowling did for the potter series. So when an author dies atleast his work can be finished, when an author is being an ass (like Togashi Yoshihiro) they can just sack him and let someone else continue drawing and the like. And it would provide for a more coherent story wich helps the author to focus more on character development and stuff.
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