Coz the plot requires so. Wano cannot be opened until they have a ryuma level samurai as he's the only one capable of instilling fear on the wg. A mere yonko isn't capable of that and that's the reason why zkk hasn't happened yet coz Zoro is not yet on that level. Only when he's capable of one shotting kaido that zkk will happen.
Just like Sanjis arc(wci), wano is just introduction of zoros arc. Sanjis plot about revenge against his family hasn't happened yet as it will only happen once he becomes the best creation there is, better than any of vegapunks creation. Same for Zoro as the next ryuma who would instill fear on wg.
Just like Sanjis arc(wci), wano is just introduction of zoros arc. Sanjis plot about revenge against his family hasn't happened yet as it will only happen once he becomes the best creation there is, better than any of vegapunks creation. Same for Zoro as the next ryuma who would instill fear on wg.
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