#62
A combined attack from Kaidou/Big Mom could'nt chip pre-AdvCOC Sandai. I don't think anything Sanji could do to replicate such force.
I'm not making an argument for just the force of Sanji's kick being able to break/bend/chip Zoro's swords tho but the force of his kick combined with Sanji's current durability buff'd by his armament. I'm not an expert on physics, but I could fire air with lot of pressure at a metal sword and it would only end up blowing it back or I could take sumin like a wooden stick and put a lot of velocity behind it but it'd end up shattering on contact with a metal sword fixed in place. So basically the hardness of said substance is also important.
As powerful as Hakai is I don't think it's a simple as " 'Force behind Hakai' > 'Force behind Sanji's attack' therefore Sanji cannot break Zoro's sword".

Will Oda ever write Sanji breaking Zoro's sword tho, I doubt it, as I think if Oda was gonna write Zoro's sword broken it'd have been broken already. Can Sanji even break Zoro's sword atm, even with his exoskeleton buff'd by armament? maybe, maybe not but personally I don't think it's that far-fetched as long as it isn't a black blade as those are said to be unbreakable.
 
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