I remember in the marineford when somebody noted that Blackbeard himself was not human after consuming two devil fruits.
I believe that he is the son of clipso and a "D," that died some point after Roger's golden era.
What do you think?
Considering Poseiden, pluton, and Uranus being presented by Oda I figure such assumption is possible.
Even Buggy mentioned something about captain john's treasure or Davy jones locker (not clear on which one).
So I'm gonna use pirates of the Caribbean logic here and say "Clipso," sea god (whatever it is) will make its appearence.
For starters infracted because for some weird reason you found it necessary to insult people from the get-go, resulting in your theory becoming even less baseless than it already was, for so far that was possible, by provoking people who might not agree.
Secondly it's Calypso, not clipso. Auto correct or not, you can always change it.
Thirdly Poseidon and Uranus are figures from Greek mythology. Pluton from Roman mythology. On top of that they were all high gods and in OP they are the only three ancient weapons. Calypso is a low level figure from Greek mythology and there are hundreds like her in Greek mythology, so there is absolutely nothing special about her to assume she has got anything to do with this. Even more so that Pluton is a ship and Poseidon a mermaid with a special ability, but as far as we know they are still "normal". I don't see how this is supposed to be related to BB having a weird body. Especially because Oda used Greek mythology as inspiration for other characters and themes which do not have any particular connection to this all either.
Fourthly captain John was as far as we know simply a famous pirate. One of the general zombie's on Thriller Bark was named John and confirmed to have been a famous pirate. It's also there that Luffy found the treasure mark. How this somehow is relevant to this all, is a completely mystery to me.
Fifthly Davy Jones was mentioned during the Davy Back fight and the Davy Jones lore is something that predates the POTC franchise, it's not something they created, they only gave a new version of the story for entertainment purposes. So again I really do not understand how this is even remotely relevant.
Sixthly Marco said that BB's body was atypical. Whatever he meant has so far not been clarified nor have we gotten any additional info on the matter.
Conclusion: everything you just said was baseless and completely random. Your supposed "logic" is void of any kind of logic.