Even as a mega Sanji fan, I have to say one of my biggest pet peeves is checklist scaling.
Shanks literally only uses a blade, aCoA, aCoO, and aCoC. Comparatively, Kaido uses a kanabo, mythical zoan with magma flames, lightning, tornados, clouds, flight, insane regen and dura, and aCoA, aCoO, aCoC. Based on checklist scaling, Kaido >>>>>> Shanks. But we know its more like Kaido ~ Shanks. Oda doesn't care about all this. What matters is characters feats and results, not all of the things they have in their toolbox.