User blog comment:Mythical zoan fruit enthusiast/I'll never forgive you!!! Unless.../@comment-3273232-20130811031741/@comment-6920514-20130811223749

Roranoa, is it because neither of them have been a main story arc antagonist(since Akainu was just part of the trio of admirals at Marineford)? If Luffy & co. wanna reach their goals they will have to go through Sakazuki and Blackbeard, so I consider them kind of as the overall story antagonists. You could say the same about the other Yonko or Admirals sure but I think the series is set up for them to be the last "bosses"