If true, SCVI would have a smaller roster than SCV at launch, even if you only count one of the mimics. And if you did count the mimics separately, Dampierre and Devil Jin's moveset, you'd have a bigger roster than SCVI with even the DLC. Either way, regardless on whether this leak is true or not, can't wait for people complaining when their favourite character doesn't get in, especially the ones who's adventures didn't start until SCII/SCIII/SCIV.
Also, Zoro would mean nothing to me as I have not watched any of One Piece.