One Piece fans believe Luffy’s base form is on the level of a Yonko, but Kaido had already disproved this long before ...
Not every One Piece antagonist needs a deep flashback; Kaido's narrative sufficed to establish him as a compelling villain.
The One Piece community can't save the Wano Country arc's greatness as Eiichiro Oda blatantly uses plot armor to save Kin'emon from Kaido.
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.
One Piece chapter 1137, which recently came out, mostly focused on Road telling Luffy, Zoro, and Nami about King Harald's history while the new Holy Knights, Gunko and Shamrock, tortured Loki.