@Paperchampion23 going by this:
Akainu: "
You don't need to create excuses on their behalf. And what about Princess Vivi's disappearance, which happened at the same time as King Cobra's murder... ?"
I reread it and it seems everything did happen on the 4th day with the RA. Everything related to Alabasta happened on the 4th day, including Vivi disappearing. Which again I don't think is a mere coincidence that Sabo is framed for the death of Vivi's father and she's disappeared. Oda's likely going to have Vivi become a political symbol for the RA as well down the line, since she's always been trying to uphold a proper way to run the nation during the reverie.
This would just be another way the RA took a W against Imu. Likely scenario i imagine is Kobra died trying to save Vivi, but in trying to make it so Vivi is out of the picture, Sabo did something that made it seem like he killed Kobra.
Also this implies the WG put a info lockdown so people in the reverie didn't know about the RA & Alabasta until much after the reverie.