He beat him because of his hax, which nobody refutes, but that hax puts him somewhere in the high tier spectrum, because his physical capabilities can´t keep with those guys, hence the claim "if Law could cut a Yonkou, he would be PK lvl" or would have become Pirate King already is nonsense.
Law is in a perfect situation in which he can have the tankier guys confront the Yonkou directly and he can do what he does best, step back and use his hax.
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Sure, let me see when Law confronts a Yonkou directly or clashes with them.