What cope? The more explicit reference to the samurai way of death is linked to Usopp's scene and his criticism of bushido ideals, which is supported by Izo. You are free to read that Oda is hinting at Zoro killing Kaido (I assume that's what you have in mind), but, first and foremost, this is Oda questionning Wano's culture through one of the main characters and a native who got to leave and know better.