How will Luffy beat Kaido, the “Strongest Creature in the World”? I don’t think the different forms of Gear Fourth would be able to even put a scratch on Kaido.
As of now, Luffy hasn’t shown his most powerful attacks he would have learnt during his 2 years of training. My theory is that Conquerer’s Haki would be the X factor in defeating Kaido.
Let’s first recap the different types of Haki :
-Kenbunshoku Haki(Observation Haki), which grants users a sixth sense of the world around them and limited precognitive abilities. Users can hone their skills to such a degree that they can seemingly predict the future, as seen with Charlotte Katakuri.
-Busoshoku Haki(Armament Haki), which allows the user to use their spirit as armor to defend against attacks or to make their own attacks more potent. Users can learn to use the Koka Technique over their entire body and\or weapons.
-Haoshoku Haki(Conqueror’s Haki), a rare type of Haki only one in a million can use which grants the user the ability to overpower the will of others.
So to summarize, Kenbunshoku Haki is for defence only. Busoshoku Haki is for both defense and offense. Haoshoku Haki should be for offense only. However, I think Oda has downplayed Haoshoku Haki in One Piece till now.
How has Luffy really utilized Haoshoku Haki till now?
Amazon Lily Arc – Luffy overpowered the will of people around him but he couldn’t control it then. Same thing happened in Marineford.
After timeskip, Luffy is able to overpower more than 50,000 people using Haoshoku Haki.
But here are the observations:
Haoshoku Haki wasn’t used to take down Hody Jones, Caesar, Doflamingo, Cracker or Katakuri. Luffy used different Gears and forms to fight with these enemies. His main weapon was Busoshoku Haki in all these fights.
But think about it, Haoshoku Haki couldn’t be used to overcome the will of these strong pirates. Neither it could be used to overcome the will of current Yonko Kaido. So can it still be used to beat a Yonko?
Now let’s see how Oda has subtly explained the other possible uses of Haoshoku Haki.
In Dressrosa, we saw Dagama talk about his King Punch.
So how does the King Punch work? He warmed up for 1 hour and then just punched the air, sending a shockwave which destroyed a fort. He is not using Bosushoku Haki, as the King would need to actually hit the surface of the fort with this Haki in order to destroy the fort. He also didn’t have any devil fruit powers when he used his punch. Although he lost the fight, but his punch was quite powerful.
In the above pic, it says ‘That creepy aura’. My theory is that this punch is another example of use of Haoshoku Haki. This Haki can enable a user to send shockwaves.
I think Luffy will use Haoshoku Haki in his next transformation – Gear Fifth. This will make him quite powerful – equivalent to Kaido.
*Theory by Ashim Goyal