During their face off at the Edd War, Shiki the Golden Lion while pointing in the direction of Roger said “We’ll use that apocalyptic weapon you’ve found and my military might!” meaning he was proposing an alliance.
But what was he pointing at? A lot of people acknowledge that he was pointing at the huge spotted egg that was on the Oro Jackson.
Now “apocalyptic weapon” could only reference to the ancient weapons the World Government is also looking for. And Roger already acquired it during that time, two years before he found Raftel and conquered the Grand Line.
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Given that the three Ancient Weapons are Poseidon, Pluton and Uranus, is this egg Uranus? I believe so via process of elimination.
Although Pluton has not yet been mentioned in the novel, it has been described as a powerful, ancient spacecraft. Pluton’s precise location is still unclear, although the Alabasta Poneglyph offers information about it. Why didn’t Cobra mention Roger in the Tomb of the Kings if Roger was aware of the Pluton in Alabasta?
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Why did Cobra not have a saddened/noticeable expression when he read that Roger was executed?
Instead, he was more worried about the ‘terrible age’ that would begin.
Furthermore, it’s been hinted many times that the Pluton in Alabasta will be found and awakened by a group with bad intentions (World Government? Blackbeard?).
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Princess Shirahoshi is the current form of Poseidon.It’s impossible for Roger to have found Poseidon – he was going to die from his disease soon and Poseidon would be born 11 years later after the Battle of Edd War; so Roger left this job to a pirate with his will (Luffy) who would be around when the Poseidon would.
This leaves Uranus. Gol D. Roger used to transport on his ship a strange big egg. When Shiki asked Roger to form an alliance, Roger refused and, while Shiki was trying to attack him, a sudden storm arrived and destroyed all Shiki’s ships.
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“Uranus” was the name of the greek god who was able to control the weather, maybe that storm was caused by the Ancestral Weapon which just wanted to protect its owner from a danger, although in that moment Uranus wasn’t born yet or anyway it was sleeping in its egg.