In One Piece Chapter 1060, Im shows an insane power which one shots an island out of existence. Let’s assume this is Uranus the Ancient Weapon.
A lot of people are questioning why Im has not used this power before on places like Ohara and Wano. There have been a few convincing answers to this but I have another plausible explanation. The reason why Im didn’t use Uranus before is because they couldn’t use its power themselves. They needed someone, a key to unlock this power. And the key is Vivi.
This could explain why it only appeared/was used now. Im currently has Vivi captured and can now freely use Uranus. This would explain why Im had Vivi’s photo, even taking it with him/her to the empty throne. In perfect condition even.
Uranus is only used after Vivi disappears. The Nefertari Family is one of the twenty royal families which founded the World Government. Crocodile was looking for Pluton on Alabasta but that’s in Wano. What if Uranus was in Alabasta instead? The info about it could’ve been on the Poneglyph inside the buried dome. And the Nefertari Family bloodline could be the key to using it kinda like Shirahoshi being Poseidon.
Cobra could’ve been killed because he asked the wrong question and because Im didn’t need 2 keys to Uranus. This would be an interesting way of making Vivi relevant again. And this would mean Luffy has a strong connection to all three Ancient Weapons.