User blog comment:Kaido King of the Beasts/The Potholes of One Piece/@comment-25313233-20140817011235/@comment-4846184-20140817021939

"plothole is a gap or inconsistency in a storyline that creates a paradox in the story that cannot be reconciled with any explanation".

Just because certian things haven't been revealed by Oda doesn't make them plot holes, there more like unanswered questions.