User blog comment:Kaido King of the Beasts/Baseless Predictions/@comment-5391752-20140522023440/@comment-5391752-20140522023613

Surprise! The new Navy HQ is actually on Raftel. But Red Hair would go to war with them in the previous arc, and open the way to the Red Sea.

Akainu will find his way there and be the boss of that arc, and he'll be in his element. Something will happen during the fight which causes volcanoes to erupt all along the Red Line. Maybe that would the 3rd Ancient Weapon.