Iirc someone I debated with on this issue at the time said the ting about Ryuma slaying a Dragon in the capital was mentioned in a different context not Monster. Not sure if was the actual story or some external source. Btw Ryuma actually slayed a western dragon in monster but according to that person he’s also apparently slayed an eastern one but I can’t verify any of this info as I just don’t know
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That said, an editor however did allude to something like this (I.e someone slaying a Dragon on Wano) in one of the OP magazines iirc, tho I’m not sure if that was their source.
Also, the point of posting that wasn’t to challenge the Zoro slaying the Dragon in the flower capital notion but rather coz I noticed the story itself was off in the post I quoted ^^