Seems obvious now...
The hole on Enies Lobby is identical to this one.
Therefore we can safely assume that mother flame is something used as fuel for the Ancient Weapon Uranus which in the past was used in Enies Lobby for some reason.
I can also see a subplot which would explain why the celestial dragons live on top of the Red Line: To be safe from all the flooding caused in the rest of the world by the use of Uranus. And it also ties to the Great Cleansing which would be the use of the weapon to basically drown the rest of the world.
PS: Its obviously not Pluton as Pluton is trapped beneath Wano and WG does NOT have its blueprints otherwise they wouldnt have struggled so hard to get them in Water 7. Therefore its Uranus.
Imu building Enies Lobby over an island they obliterated sounds like the kind of petty shit they'd do at this point, honestly.
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My crackpot theory is that the BBP will kill kizaru and steal his fruit
Blackbeard with both the Darkness Logia and Light Logia would be so hilariously overpowered. How would that even work?
I still think Teach has the Cerberus Mythical Zoan, which lets you eat two other Fruits (one Logia and one Paramecia), meaning he would already be filled up, but Light Speed Teach sounds amazing.