Lmfao Law had Doflamigo beat but for an emergency surgery which only he would be able to do, the only person in the entire world, and you think DR Zoro would destroy law?
Law had to act being dead to hit Doflamingo with Gammaknife. Law is strong but Zoro is objectively stronger. Superior swordsmanship, superior physical strength, attack speed and haki.
Law had to pull out a mountain sized room to slice a mountain whilst Zoro casually cut Pica's arm in several pieces with haki slashes.
Do you think that Doflamingo would humiliate Zoro like that as well when the latter put up a good fight against Fujitora and pushed him away despite being crushed by his gravity? And do you realise that Zoro overpowered this gravity and, as I said, pushed Fuji away with an Ittoryu slash?