User blog comment:Fliu/Chapter 933: A Wano Rose Withers?/@comment-24850639-20190215184516/@comment-53539-20190215225317

Oda's logic with the fruit not being Ryu Ryu no mi, is likely because Oda is establishing a sort of "order" to the DF, with the dragons being some sort of strongest.

That or he just sees it as a Japanese hydra, a hydra being a snake.

I want to see a hydra fruit.