One Piece: Chapter 999

Why are people assuming Kaido started out as a fish and turned into a dragon? It's just a standard mythical Zoan fruit. Did Sengoku awaken to transform into a Buddah? No, he has the human human: model Buddah fruit. Just like kaido has the fish fish: model dragon fruit.

But what about the legend about the koi turning into a dragon?

Yes, that is already accounted for. That's built into the fruit. There's a legend of a human turning into Buddah after achieving enlightenment. Did Sengoku start out with no powers and then "awaken" into a Buddah? Did marco start out as a regular bird and then turn into a Phoenix? No, they were that from the start. Just like Kaido was always a dragon from the get go.

/r/OnePiece Thread