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I might be reading into this more than I should , but here it goes:
DD may be involved with or possibly in possession of the ancient weapon Uranus :
-Uranus was the sky titan and DD is nick named the sky demon and kaido has the epithet hundred-beast this may refer to the hecatonchires one of the offspring of Uranus and Gaia ; either Kaido or DD may have control over this weapon. ( Since the hecatonchires was an offspring of Uranus , I suspect Kaido's rise to power may have been partly due to the use of Uranus)
Dressarosa happens to have coliseum characteristic of the ones used in ancient Rome , the mythology seems to fit
-The presence of CPAegis0 , aegis is a shield/other piece of armor often associated with the greek/roman gods , since this is so, I suspect CP0's purpose is to act as a shield against ancient weapons.
There are very often links between the history of our planet and the story of One Piece. I personally don't know much about the mythology but I think you are indeed reading a bit too much into it. Don't get me wrong - you don't necessarily have to be wrong but I think it is too early to speculate about Uranus.
Anyway Uranus is the Ancient Weapon Oda didn't reveal to us yet. I hope he will do it sooner or later and CP0 seems a hint.
However the other two Ancient Weapons were disclosed during water-themed Arcs by fishmen. So Dressrosa Arc seems out of pattern for now.
Maybe we should wait Green Bit Arc.