We know he killed a dragon.
So far we have not seen a real dragon in OP. Just VP’s creations and the Seiryu DF.
We know the gorosei all have mythical zoan DFs.
imo the Dragon that Ryuma killed was actually a gorosei that had the seiryu fruit. That is why the WG never tried to conquer wano throughout the years. The last time they tried, they lost a Gorosei.
So far we have not seen a real dragon in OP. Just VP’s creations and the Seiryu DF.
We know the gorosei all have mythical zoan DFs.
imo the Dragon that Ryuma killed was actually a gorosei that had the seiryu fruit. That is why the WG never tried to conquer wano throughout the years. The last time they tried, they lost a Gorosei.