Lol, what a beautiful thing to see. But seriously, WB would lose, oden said that the protagonists of the war that will take place 20 years in the future,
they would be the only ones to overthrow kaido, it is predestined, no matter who has gone to wano before, that person would not be able to defeat him.
But I hope that in the past of kaido there will be a 1v1 between him and wb.
If kaido lost it was probably due to the age difference.