To understand why you first gotta understand who kaido is The guy is one of the strongest in the entire one piece universe while luffy is just someone who is a pirate for around 4 years And this same dude says to him without the slightest hint of fear or doubt that he is going to surpass him and become the pirate kingOne Piece Chapter 1021 is the chapter from One Piece, created by Oda, Eiichiro (尾田 栄一郎) and the artist Oda, Eiichiro (尾田 栄一郎) and released at 1997, and the the manga One Piece fall into those genres action, adventure, comedy, drama, super power, shounen, fantasy The entire summary of manga One Piece The story starts with a well known pirate his name is Gol D RogerOne Piece Chapter 1 000
Chapter 992 One Piece Wiki Fandom