There is a plot for what happen at the end of the chapter.
1. BM take Kaido Soul and become more powerful. Which is kinda weird but something must happening at this momment, and BM pirates still around they cant be just strolling around wano.
2. Kaido revived after a fast nap, then he help BM out from the sea floor to clear his debt. Then he show himself at the middle of capital city and this is where its end. Which is best plot i think.