For a long time, many movie antagonists were clearly inspired by some of the manga villains (e.g.: Gasparde - Crocodile, Tesoro - DoFlamingo, etc.), but they at least had different backgrounds, they looked unique. Kaido is just Douglas Bullet with distinct looks and abilities (even Douglas Bullet's backstory with the Roger Pirates is virtually identical to Kaido's backstory with the Rocks Pirates... I'd bet that Bullet would be Rocks' crewmate instead of a Roger's crewmate if he was older).
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