One Piece Magazine Volume 6 outright says: "It's been several hundreds of years since Ryuma's death. Perhaps a strong samurai who people can call the 'second Ryuma' has already been born.":
Given that Ryuma's most iconic legend is slaying a dragon over the capital, in order for Oda to credibly depict Zoro as the second Ryuma, Zoro would have to play a huge role in the defeat of the dragon tyrant terrorising the country. This is very synergistic with the One Piece Magazine Volume 5 mentioning that a new legend of slaying an Eastern Dragon will be born. Just as Ryuma had his own legend of slaying a Western Dragon:
So also might Zoro forge his own legend by slaying an Eastern Dragon and saving the country. Zoro will likely leave Wano recognised as the "Second Ryuma".