One Piece fans believe Luffy’s base form is on the level of a Yonko, but Kaido had already disproved this long before Kizaru's recent clash.

Seiryu could transform Zoro's strength, swordsmanship, and battle dynamics, making him unstoppable in One Piece.

Not every One Piece antagonist needs a deep flashback; Kaido's narrative sufficed to establish him as a compelling villain.

One move Kaido used against Gear 5 Luffy during their final showdown was ... the end of the world), tying it to the Elbaph Island's theme. Plus, the 'three worlds' also paralleling the 'three ...

Speculation on Luffy's next transformation includes flames engulfing his hair, blending themes from Gear Five ... one of Hanuman's aliases, to defeat Kaido, the strongest beast in One Piece.

He has some strong similarities to Kaido, so he may be a hybrid from the Giant race. This is coupled with the fact that he has an attack named Ragnarok, which fits with the Nordic theme of Elbaph ...