We have Zunesha, we have Big Mom leaving Wano to protect Whole Cake Island, we have Zoro, we have possible Momonosuke fighting, we have the remaining Strawhats. You can have Kaido be interesting by him turning into a awakened rampaging Dragon monster which will make him a strong obstacle but not fast or smart enough that the other Strawhats can't help out. You also have Orochi who could come back and act as foes for Ussop and Momonosuke.
- Zunesha basically came to confirm to us that Luffy is literally Joy Boy and be Momo's puppet once again. Whatever role he has left in the arc is purely lore driven.
- Big Mom getting away and still having future storylines wouldn't improve her performance and characterization in this arc. On the contrary, it would be more evidence that Oda DIDN'T NEED to cram her into Wano as well.
- Momo fighting would be bullshit as well just because he has Oden's blood and genes while Hiyori, who has STAYED IN WANO 20 YEARS under the wise of a fucking profficient swordsman, DIDN'T HAVE ANY ELABORATED PLAN ABOUT DEALING WITH OROCHI OTHER THAN CRYING LIKE A BITCH AND HOPING TO GET SAVED. Do you see Momo slaying Kaido while Hiyori has been SO USELESS as something that improves Kaido?
- The remaining SHs are tired from the fighting, the fire and running in fucking circles all night. And even then it's too late for Oda to make it believable that they can face Kaido, LET ALONE AN AWAKENED KAIDO, for more than 5 seconds.
- If you think Orochi coming back to be a challenge for Usopp after Oda did him so dirty with the Page One fight you're literally out of your fucking mind.
Keep coping and hoping, Oda wankers. It's so much fun.