Maybe Zoro isn't as strong as I thought he was??
After all despite having best performance on the roof top and Law and Kidd doing next to nothing Zoros final W was against YC1 while Law and Kidds was against a Yonko as much of a Meme as she maybe.
If Oda wanted zoros feats to reflect his power level, he could have given Zoro the W on yonko too.