My point in that sentence was that Kaido's influence as a Yonko, as a major power of the world at large, is far more important than him being a dragon. Zoro killing him wouldn't just be a cool symbolic parallel with Ryuma's legend, it would be him irreversibly becoming a top threat in the eyes of the whole world after killing one of the four emperors.
Even if in the eyes of the reader Luffy was the one who did most of the work, Zoro killing Kaido carries way more weight for the people of Wano, for the entire world, which would result in him upstaging Luffy even if all he did was land the finishing blow.
We can't really compare this to Gin technically landing the final blow on Krieg, Kaido has far more importance than that. If ZKK were to happen, it would be a flashy event at the top of the flower capital where all the people below could see it (Zoro wouldn't just cut the head off of someone who is aready unconscious); and thanks to Drake and CP0 being there it would result in the news of the event spreading through the world immediatly after.
Kaido is too important of a figure to be killed by Zoro.
Even if in the eyes of the reader Luffy was the one who did most of the work, Zoro killing Kaido carries way more weight for the people of Wano, for the entire world, which would result in him upstaging Luffy even if all he did was land the finishing blow.
We can't really compare this to Gin technically landing the final blow on Krieg, Kaido has far more importance than that. If ZKK were to happen, it would be a flashy event at the top of the flower capital where all the people below could see it (Zoro wouldn't just cut the head off of someone who is aready unconscious); and thanks to Drake and CP0 being there it would result in the news of the event spreading through the world immediatly after.
Kaido is too important of a figure to be killed by Zoro.