>>281215035
>that it's Akainu lighting Mariejois on fire
You forget there's another entire group of flame users, and the last person they followed was Saturn. And now Saturn is dead and a certain person who can shapeshift just touched Saturn and then was teleported out. And that certain teleporter told Saturn to his face that the goal was the world. And that particular crew's father threatened Imu to their face just a few chapters ago and said he would take the world.

Put two and two together. Blackbeard just stole the Seraphim and set them loose on Marijoise.