I don't recall he ever saying that. He just got PTSD.
He went hybrid because of Zoro cutting his scales when he tried to eat Luffy. Zoro shocked Kaido way more when Big Mom screamed him to dodge, blocking Hakai, winning the trade on Asura, and leaving a scar on him.
He went hybrid because of Zoro cutting his scales when he tried to eat Luffy. Zoro shocked Kaido way more when Big Mom screamed him to dodge, blocking Hakai, winning the trade on Asura, and leaving a scar on him.
About the scabbards, he said there they were not even able to reopen his old wound and other a samurai like Oden was unique.