The part with #1 world ranking seems to be a separate gag, they're showing what the 1st ranked world looks like and inside is the Dragon Ball world. It does look confusing because the panel came directly after the book upgrade.
Adding to this, instead of just adding koatoru (coatl) behind ketsuana, the author instead used koaretoru, likely a pun with koware (to rip open). So his name means butthole ripper 😂