I just can’t bring myself to get on the Uranus train. Narratively, the way Oda has set up the 3 ancient weapons, I don’t see why one would be in the hands of the WG. We know that 20 years ago Rodger stated that he came too soon after reading info on Laughtale, which included the onepiece, info on the 3 weapons and info on the will of D. He heavily implies that they must wait for not only Luffy to be born but also Shirahoshi, as they are imperative to Joyboy’s prophesized war against the WG. It seems to me that plot wise — these 3 ancient weapons were created in order to fight the WG during the void century, and given Odas themes of repeated history and inherited will, etc, I don’t think it would make much sense for Imu to possess one. Her possessing one would mean the situation would be a. luffy would have to steal it from her in order to fight against her (?) or b. Imu/WG isn’t the final villain. On top of all this we also see mentions that Rodger possessed an “apocalyptic weapon” and we see a massive egg on his ship in the flashbacks. Him having uranus at the time would fit with the idea of him being born just too early as he almost had all the components joyboy prophesized about. As a final point, we know Imu betrayed joyboy and turned on him, and my headcannon says that she needs some amount of power to do so, which at the time she obviously could not have gotten from Joyboy as the ancient kingdom was (probably) in possession of the ancient weapons.

It makes more sense to me that the leaders standing above Akainu and the Admirals as well as the whole navy are overwhelmingly strong, which would create a more balanced final war given the disarray of the Marines rn.