One Piece: From the Start, I Got a Mythical Zoan and Won Big

[Koby gets slaughtered] [Mythical Zoan Fruit] [Advanced Armament Haki + peerless physique + supreme martial arts]

“Mr. Yige, please stop! Enough people have already died in this war...”

At the Paramount War, when Koby stood in Yige's way, righteous and resolute, Yige answered with a scorching punch straight through his chest.

What if Smoker mastered martial arts and Haki, while Zephyr and Garp were no longer held back by old age and failing health?

What if Aokiji never left, and Fujitora and Green Bull both joined the Marines...?

Sengoku: We have no regrets about the justice we uphold!