When the final battle of OP starts the area will be full with top tiers and dozens of vets/high tiers.
It doesn't matter if you support the Gorosei or the Navy or the Emperors as the final fights, one thing is clear, a small place like Mariejois wont be able to withstand so many powerful people fighting all out.
Unless Oda's plan is to make a new MF 2.0, full of small skirmishes and off panel defeats, the only place imo that can support a battle of this scale is Alabasta desert.
It doesn't matter if you support the Gorosei or the Navy or the Emperors as the final fights, one thing is clear, a small place like Mariejois wont be able to withstand so many powerful people fighting all out.
Unless Oda's plan is to make a new MF 2.0, full of small skirmishes and off panel defeats, the only place imo that can support a battle of this scale is Alabasta desert.