The strongest swordsman in the world of One Piece is currently Dracule Mihawk. However, many fans have speculated whether Ethanbaron V. Nusjuro, a member of the Celestial Dragons, might actually be the strongest swordsman instead.

Below are five compelling reasons to consider:
1. Nusjuro’s sword is said to be Shodai Kitetsu
The sword of Nusjuro is long believed to be the Shodai Kitetsu, one of the three cursed Kitetsu swords. If true, this sword would be one of the twelve Supreme Grade swords (Saijo O Wazamono).

Additionally, the sword of Nusjuro is on par with Mihawk’s black blade, Yoru.
2. Mihawk becoming the strongest swordsman may not have included a duel with Nusjuro
Mihawk became the strongest swordsman in the world through defeating numerous powerful opponents. For instance, it is said that many of his victories were against the powerful marine Admiral, to the point where he earned the title “Marine Hunter.”

However, it is possible that Mihawk has never fought Nusjuro, as Nusjuro is one of the Celestial Dragons—five powerful individuals who often wield significant influence over the world. Nusjuro may have even previously escaped from Mary Geoise for an extended period.
3. Nusjuro is believed to have awakened the Zoan-type Devil Fruit
When Sabo confronted the Celestial Dragons and Im, all forms seemed to transform. This suggests that those who have awakened the Zoan-type Devil Fruit are very powerful.
In chapter 1094, when Saturn acted, the form shift of this character displayed unique characteristics resembling the awakened Zoan form of Lucci. If Saturn can awaken a Zoan form, other Celestial Dragons and Im could also possess similar powers.

Now, imagine a swordsman who can transform into a powerful Zoan form. That would indeed be incredibly strong.
Considering the unique transformations of the Celestial Dragons, Nusjuro might have awakened a Zoan form that enhances his abilities. Therefore, beyond transformation and increasing strength, he could also possess other extraordinary powers.
4. Known as the Godhead
Nusjuro is referred to as the Godhead of Finance. Whether known as Godhead or Warrior God, Nusjuro is not just a Celestial Dragon but also a figure of immense power in battles.

This can be observed from the fact that all Celestial Dragons and Im seem unaffected by the chaos caused by Sabo’s attack.
In chapter 1094, even though we only see a glimpse, it is evident that the strength of the Celestial Dragon Saturn is not to be underestimated. Nusjuro could be similar.
5. The Celestial Dragons do not wear the typical attire, indicating their strength
All Celestial Dragons are known as Tenryuubito. However, they do not wear the traditional attire or symbols, unlike usual Tenryuubito.

Therefore, it is believed that these Celestial Dragons do not wear the typical attire, indicating that they are incredibly powerful.
For instance, Doflamingo, a Celestial Dragon, after being exiled from Mary Geoise, became one of the strongest warriors in One Piece.