Those bounties make no sense whatsoever.
Luffy starts at 1.5 billion, the other two at 500 million.
Those two barely manage to push BM off Onigashima in a 2 vs 1, not even knock her out/defeat her with their own powers btw.
Luffy convincingly defeats Kaido in a 1 vs 1, while awakening his God DF that the WG was afraid of for 900 years.
"Yeah, all of them 3 billion"
And why tf is Luffy emperor then and the other two not?
Oda lost it.