User blog comment:Ricizubi/Luffy's Evolution and why becoming pirate king is going to be quite a storytelling challenge/@comment-3203286-20180420162832/@comment-3986064-20180420171836

There's one thing about stories or plans. They evolve over time. I think he already stated that he changed it originally from how it was going to be, but I have no source to back me up. In the end, if he deviated from the original script, it might simply become infuriatingly hard to come up with a satisfying ending.