- The challenge is supposed to be demonstrated in front of Big Mom. That is the reason why Kaido gathered them to meet big mom.
- Kaido wants to show strength of flying six to big mom
- If one of Flying Six win against the calamities, they can replace the respective All-Star
- Kaido wants to show strength of flying six to big mom
- If one of Flying Six win against the calamities, they can replace the respective All-Star
Overall this line even make sense, since Kaido want show Big mom the flying six already in chapter 976.
But the hype for the flying six still increase a lot, of course the fight don´t gonna start because of the alliance but in that case Oda perfectly hype already the flying six. I read even comments where people though Sasaki and Who´s Who bounties are at least in same range as Jack, in that case it would make sense.