I also think it's related because of the coinciding theory that Imu (or Umi) represents the sea. Could it be that Imu is legitimately the God of the Sea, and is the one responsible for the cursed nature of devil fruits? Some entity has to resent the dreams of mankind quite strongly if the sea so detests devil fruit users.
It also makes sense that the celestial dragons would live high above the world along the Red Line if the ultimate goal is to flood the world again, making the Red Line the new island chain.
IDK, the red line has always fascinated me. Ever since the first time it was shown way back in the day I've wondered why the world is the way it is, and why nobody seems to take up residence along the Red Line. Then finding out that the world nobles live there made all the sense in the world.
and that the former residents were persecuted and killed. The world nobles are the descendants of the original world government leaders and it was likely that the WG is built on top of the bones of the countless governments that fought against them. Its why the WG would want to keep the void century a secret because it would paint them in the worst light. Trying to hide against their ancestral sins that they probably continue to celebrate to this day.