Sigh...can't tell if you're just feigning ignorance or simply can't view Sanji objectively.
Kin'emon who was one shot by Law on PH, is the same Kin that was hurting your so called "World's strongest creature" left right and center on the rooftop, and not only him, all of the Scabbards, even Raizo who most on this forum wrote off as a scrub since his introduction was capable of hurting Kaido. Then there is the Supernova, who were all able to damage Kaido in someway even though none save Luffy and maybe Law due to Gamma Knife had no business hurting Kaido on paper prior to that encounter. All of these things which defied our PL headcanon or whatever, happened simply coz the narrative demanded it.
Even with all the above, you really think that if Sanji of all people who Oda has put on has pedestal several times this arc is written to fight against Kaido he would do fck all against him?

Come on man, you can't be that close minded.