I doubt I’m the only one who thinks this. Oden was the only person to damage Kaido. He scarred him with his swords, creating an X-shaped scar.
Oden created the chink in Kaido’s armour that will be exploited to vanquish him.
Yes. Luffy will land an Advanced Armament Haki strike precisely at Kaido’s scar as the ultimate attack that brings down the Strongest Creature in the World.
I’m sure it will be a drawn out battle with many combatants, but I think this would be a fitting way to bring Oden into the climax of Wano. Luffy will be able to finish what Oden started.