- Why didn't Kaido pick up a sword to fight Oden?
- Why didn't Garp pick up a sword to fight Roger
He never once fought seriously at Marineford.
He literally only used those attacks against fodder.
The only character that effectively fought Borsalino is Rayleigh.
Nope. He's only sniped fodder and when he was trolling his opponents.
By this logic, Mama doesn't use a real sword but one made from her soul. Borsalino's sword is created by one of his signature techniques, and in real life is a national treasure of Japan.
If Hybrid King reveals himself to be a swordsman and Sanji defeats him, I'll be willing to seriously entertain the possibility that non Zoro Strawhats can defeat strong swordsmen. Otherwise, all the formidable swordsmen adversaries have been felled by Zoro.
I already answered this: