Here's what the author Eiichiro Oda has to say about this. Zoro himself is a three-sword style swordsman, and fans have seen him wield some of the most amazing blades over the years. Zoro ...
In the fight against Hatchan, Zoro uses Toro Nagashi to overcome the former’s Six Sword Style. When used against Kuma, Zoro was able to stave off a powerful attack from the former Warlord but ...
His new techniques like King of Hell style and ... a legendary sword that once belonged to Kozuki Oden, challenged him to control his Haki even further, pushing his limits. Zoro’s power ceiling ...
Zoro could potentially blacken one of his swords soon. In the Elbaf arc ... needs in order to maximize the usage of the King of Hell style, and hopefully, it will allow him to grow even stronger ...