Assuming the info is indeed accurate, this would have to be where the bounties stack up:
Gol D. Roger - ฿5,564,800,000 - Captain; Pirate King
Edward Newgate - ฿5,046,000,000 - Captain; Emperor
Kaido - ฿4,611,100,000 - Governor-General; Emperor
Charlotte Linlin - ฿4,388,000,000 - Captain...