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Originally Posted by james0246
Ah, but then we encounter the problem of whether or not the manga chapter is actually canon or not, and if it is, whether the subsequent film is actually connected to the chapter (i.e. the manga chapter could be canon, but that doesn't make the film canon)...  . |
You have to ask yourself this: Why would Oda go out of his way by making a volume that predates the current story by 20 years and contains Roger vs. Shiki, only to not make it canon? Anything that deals with Roger's era is very significant, and I don't think that Oda would elaborate on these important events if they meant nothing to the overall story.
I'll concede there's a very good possibility the movie won't be canon, but volume 0 will most likely contain information that is vital to the overall plot.