The original post suggested the idea that Big Mom and Kaido each having an interest in the Straw Hats may cause them to come into conflict with each other. Personally, I wondered if their goals regarding the Straw Hats might push them into an alliance instead. Or, at the very least, the perception of an alliance by outsiders.
Mostly I thought this because the idea of the Straw Hat Grand Fleet escaping, repelling, or even defeating the combined forces of two Emperors would be exactly the kind of major event the end of Dressrosa promised.
You mean… them getting at the Straw Hats both at the same time, but with barely any relation to each other, kinda like they are doing now but on a grander scale? Or them actually going "Let's fight together for now to get rid of these kids asap"? Because the second is practically impossible. We've seen how Whitebeard reacted to Shanks butting into his business, and they were the 2 "good" emperors. Kaidou and Big Mom, on the other hand...