@MemeTheGallant I have a similar theory that Uranus is in Dragons control and can control the weather, though I never thought that Nico Olvia could be involved as well. It does sound very plausible though! Nice theory!
I think that Uranus is the secret or possession in Mariejois that Doflamingo knows about and it's a devil fruit. In particular the Earth Earth fruit or something along those lines. It is what allowed the red line to exist in the first place and if someone gained the ability to change red line it would destroy the world government and the celestial nobles. Also, it would make the rumors of all blue make sense and why no one can find it. Someone raised the earth which created the four seas and not all blue. It can also explain (thriller bark mist is surrounding giant elephants theory) why Zou got separate from his or her herd and can't ever return to them.