Zoro fought a nerfed killer.
Stop acting dumb.
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Oda went his way to hype the cake too.
Stop making same mistakes as Sanji fans did in 2016/17 during WCi
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It did knock her out, but not forever.
Though you can't compare both situations especially difference of both arcs. It's about literally damaging and killing/defeating a Yonko. Oda not gonna wreck power scaling and have Zoro with his bad fight resume in this arc to someone defeating a Yonko. Luffy is strongest overall as captain so doesn't make sense for Zoro along to surpassed Oden's lvl in small amount of time too.
Plot direction has him facing Orochi more than wanting Kaido. So doubt it head like that along Zoro trust Luffy to fight his own battles and would look wrong him needing saving or help with him if he can't stand as his own.
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Didn't Oden uses 2 swords for that? Other being Snake Slayer? No necessarily name title go along with it. Plus if Oden needed 2 blades for it, Zoro using Enma to hurt him would be BS as he basically surpassed him in small amount of time and plus his fight record as of late hasn't been too good to see progression he can even fight Kaido.
You can compare both
Same writing style, different characters.
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These are high hopes:
Zoro vs King/kaido : sanji vs katakuri expectations
Zoro will damage/kill kaido : Sanji will K.O BM with the cake.,( Brook and Luffy will beat BM)
Zoro will get many 1 vs 1 Ws : Sanji vs X
Zoro has advanced CoA: Sanji has FS theories/fanfictions
Zoro is commander level without PU : Sanji can fight and beat one without PU
These are similar (even tho characters have different personalities):
Hiyori: playing as Pudding /Reiju/ *Niji (handing a PU to a strawhat)
Oden : Judge * both betrayed
Enma : Raid suit
Yasu : Pound
Shimotsuki : Vinsmoke
The only difference is that wano will have conclusive fights.