User blog comment:Fliu/Wano Country Arc Act 1 Thoughts/@comment-37485080-20181112060908/@comment-2600:1702:3C50:A6E0:8C9C:B4FC:C49F:A9E3-20181113014722

Agreed on the Kaido comment as far as the end of Wano. If I were to guess at the final boss of one piece, I would think that Im, Akainu, or Blackbeard would be more likely candidates.