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.
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.
Besides, there were 3 factions involved in Arabasta and Skypiea as well.
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