No, the fate narrative applies to liberating Wano, because that's the context in both cases. Realize that in both instances, Kaido is NOT mentioned. Both Luffy and Zoro are believed to have been fated to liberate Wano (via Joyboy/Ryuma), thats it.
For Zoro, this was involving his fight with King.
For Luffy, this was involving his fight with Kaido.
There is no confusion here, just exaggerated purpose placed on Zoro after the rooftop. His parallel to Ryuma does not imply that he's meant to slay a dragon literally again like some time loop. There is a reason Oda gave him that finish in 1035, alluding to the parallel.
But again, for the 1000th time, you guys believe what you want and enjoy the rest of the arc.
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Even there, go back and read Tengu's words. Forging a black blade was not implied to happen this arc. Just in the future
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He's not. Literally explained the point above. The issue is tying "fate" to "Kaido" specifically. Stop doing that and you'll know the difference.