I think Kaido got a conclusion, he wanted to die in an epic way and fight Joyboy and kind of got that. Though I guess it fits with the typical thing of ¨oh but Luffy killed their dream¨ cope Oda made in the SBS years ago, but I´m not sure what the point of him landing in Magma would be otherwise. We also know King and Queen were still on Wano, and they didn´t seem to fetch him. Big Mom is sort of in a more weird spot, and she could technically be ¨rehabilitated¨,and there wasn´t really an emotional angle to taking her out, like Luffy telling Momo he would kill Kaido, but I think the story will focus more on Katakuri as the new leader of the BMP if anything, since he´s actually on good terms with Luffy, and his crew likes him more then BM.