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Oda said in an SBS that Zoro would specialize in CoA (Busoshoku) Haki and that Sanji would specialize in CoO (Kenbunshoku) Haki. I think the reason for this has to do with their different types of training during the 2 year time-skip. If you think about it, it was only Zoro, Mihawk, and Perona on Kuraigana Island. Based on what we have seen from him throughout the series (presumably not willing to fight Shanks because Shanks only has one arm), Mihawk values honorable battles, so it is likely that he and Zoro trained one-on-one together in such a way where Zoro did not need to fear for his life or keep his guard up when they were not training. Since he is the current greatest swordsman in the world, Mihawk’s attacks are probably insanely powerful and more than likely infused with Armament Haki (unless he held back). Therefore, Zoro had no choice but to focus on his own Armament Haki growth in order to cope with Mihawk’s attacks, and to avoid his swords from breaking.

However, on Momoiro Island (Kamabbaka Kingdom), Sanji was being chased day and night for 2 years by Okamas. He had to constantly keep his guard up and avoid being ambushed by the seemingly endless droves of Okamas. It’s safe to say that these Okamas were nothing compared to Mihawk, so we saw Sanji’s physical growth in a different way as he became faster and developed moves like Blue Walk and Sky Walk. Sanji had to focus on his Observation Haki growth in order to sense the presence and intentions of an entire island that was his enemy. Now, I’m not trying to say that Sanji now has this ridiculous Observation Haki that can sense everything. I just mean he needed Observation Haki more than Armament Haki in his situation. Same as Zoro needing Armament Haki more than Observation Haki in his situation.

It can be argued that Zoro needed Observation Haki too since last time he fought Mihawk he couldn’t even land a hit and Mihawk beat him with a small dagger, but I still think Armament Haki would be more necessary than Observation Haki if he was training with Mihawk.

TL;DR: Sanji specializes in Observation Haki because his training required him to focus on surviving/running as opposed to fighting, whereas Zoro specializes in Armament Haki because his training required him to focus on reinforcing his swords against Mihawk’s strong attacks.

*Theory made by Dereshishishi

What do you think about?

It would be an epic battle, don’t you think? *___*