Where was the build up for Zoro vs Pica ? Zoro vs Daze Bones ? Zoro vs Ohm ? Zoro vs Hyouzou ?
For almost all of those arcs except for dressrosa, you only had one main faction who was involved in the fighting: the straw hats.
Wano kuni is a war between multiple factions against an enemy with multiple factions. The whole "Zoro is first mate therefore he fights king" logic would have worked in other arcs doesn't work in wano because of just how many powerful characters are in this arc.
And its not even that Zoro can't fight king. I just mentioned the lack of build up because some people on this forum have taken it as literal fact that Zoro would fight king.
in any case Marco vs King has heavy buildup due to the parallels between these two characters. Hence it makes more sense for Marco to fight king than Zoro.
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That's literally ALL of the reason. King was also bickering with Queen, like Zoro/Sanji. Parallels are there for anyone who's not blind.
I think that some parallels are more important than others. There are parallels that the fans make and then there are parallels Oda makes. While King and Queen did argue, the idea that Oda was intentionally trying to parallel zoro and sanji is completely subjective.
However, Oda directly and unambiguously parallels marco and king. This can be seen as Oda drew King in a very specific and famous scene marco was in:
When Kaido met big mom, big mom asked king to join her crew. Oda drew this exact same scene but with Whitebeard instead of kaido, Big Mom instead of shanks, and Marco instead of King.
Then he drew a scene with marco where Oda himself references king. This is when Marco showed up at the waterfall and kicks the big mom pirates down.
when you take these scenes and parallel them with the fact that marco and king's abilities are foils of each other; marco being a phoenix and king being a pteranodon with fire powers. imo it is undeniable that Oda was intentionally trying to parallel marco with king.
Can the same really be said for Zoro and sanji, who in truth have absolutely nothing in common with King and queen?