I base this theory on one of the most badass characters: King Elizabello II with the King Punch. A punch of exceptionally concentrated strength, capable of releasing an immense amount of air pressure that can cause massive damage to his surroundings, as he was reportedly able to make a hole in an enemy fortress’ wall with a single blow. It is rumored that one of his punches could even overpower one of the Four Emperors.
I think this is just part of the story. Yes the punch is insanely devastating but I think that’s just part of the power. The real gimmick comes from Elizabello II in the form of Advanced Conqueror’s Haki. As you can see in the image below there are black lightning streaks coming from the punch indicating some sort of Advanced Conqueror’s Haki.
Oda literally foreshadowed that the use of Advanced Conqueror’s Haki will be the key to defeating the Yonko.
What do you think? Let me hear your toughts.