So lack of reading comprehension it is then. No point in wasting more time on this, since that is the only piece of evidence straight from Oda.
You still haven't disproven how canonizing a character is the same is making all of that story canon too.
In fact here's the full answer-
Well, here are two questions about my old short story collection, "Wanted!" I'll tackle Ryuma's first. The zombie Ryuma appears in
Chapter 450 from this volume, and he is indeed the Ryuma who starred in "Monsters". In the world of One Piece, he's now a legendary swordsman who died of sickness. I wouldn't have minded if this had just slipped through the cracks, but I was happy to see that so many people noticed. Next, Garp. He appeared as Luffy's grandpa, and a pirate no less, in the one-shot that served as the basis for One Piece. He might look the same, but I want you to see these as different stories. Grandpa Garp from THIS One Piece is a true blue Marine, from birth till death!!
Going byyour logic, you would start claiming that the entire story revolving Garp's one shot should be canon too, where Luffy wants to be the peace main.
And while I'm at it,
@ZoroSlaysDragonTuna and
@spawn probably have cases of poor comprehension too.