Morj just made a video saying Blackbeard will get Pluton
that means Blackbeard will never get it
He's been right at least twice though (a broken clock can still be right twice a day technically too), so there is still a slim hope too. Morj is kinda like TAC except with theories rather than characters.
Theres always hope for Uranus or Poseidon too.
I kinda feel Yamato should pilot Pluton as its in Wano, she can be the one to liberate it by opening its walls with Pluton at least. Theres the infamous Japanese battleship called Yamato and a mine laying French cruiser by the name of Pluton IRL too lol:
https://en.wikipedia.org/wiki/French_cruiser_Pluton
I believe all ancient weapons are connected to Princesses like the 3 Goddesses for each part of the Triforce in Zelda for example (Yamato would be Power or Courage respectively, Vivi can be Wisdom/Courage if she is connected to Uranus or not and Shirahoshi is Courage (for the irony),
Since Franky knew Oden and was invited to join him and thus Roger potentially too and Franky and Yamato have met seperately aside from the rest of the SHs (especially Luffy as an exception ofc) and theres the themes of manhood/masculinity/being "hard boiled" with Franky, Oden and Yamato, it ties together somehow, especially with Franky having a Samurai theme post TS with his
Shogun and katana or w/e and memorising the Pluton blueprints too.
Well I'm sure you guys can make more sense of this/explain it better than I can lol.