9-Gold for some reason is a very important resource. Right after the Void Century, Shandorians were attacked for some reasons. While Shandoria has the Poneglyph revealing Poseidon, that might not be the reason behind this attack. Highly likely, it is for the gold that they own. Because if Pluton was used during the Void Century, then World Government knows that gold is an important resource.
10-Tenryuubito orders for Heavenly Tribute (Tenjoukin) which we are unsure of its contents but in kanji, it is stated as 天上金. If I were to translate it literally, gold from sky. The very reason to control gold resources, could be to control or at least prevent Pluton. Pluton also has an implied meaning to harvest and wealth from underworld. We also know that Ploutos is the god of wealth. Again, drawing the reference between Gold and Pluton.
11-Essentially, Maxim was a ship that works on conversion of energy. Franky, the last person who has seen Pluton’s blueprint, functions as converting coke into energy too. In Maxim, besides giant gears, we do see huge cylinders of liquid that’s being worked as well. Franky was also able to make use of such energy conversion to create jets for sunny go though not to the extent of flying like Maxim but the concepts could be similar. On a side note, was this the reason why Oro Jackson could escape from Shiki?
12-In Jaya Island, when the compass points to Sky Island, Robin was very certain that Sky Island exists. This knowledge could likely be from Poneglyphs and we know in Alabasta, the arc before Skypiea, there’s one that talks about Pluton’s location.
13-Why did Crocodile know and insist that Pluton is in Alabasta? If we trace back to the Poneglyph that Jinbe found and the ancient ruins and the giant sea cat that wears the same earring like Crocodile. Could it be that these ruins are from Birka, the island destroyed by Enel? And in Alabasta, we do see printings of sea cat on the wall design as well. So is Birka existing directly above Alabasta and that Crocodile saw these ruins that Enel destroyed therefore knowing about Pluton? But of course he didn’t know that it is in the sky. Similar to how the World Government doesn’t know that Pluton is in the sky.
14-Back about Enies Lobby, the design is inspired by one island in Oregon USA. The place is called Thor’s Well. Thor, thunder god. Again, relating to Enel and if Enies Lobby is indeed the original destruction by original Pluton, then the design of Enies Lobby reference Thor’s Well would have some sense.
15-To add one more point, I feel that Nami obtaining Zeus is another plot point to the end goal with Pluton and Enel.
*Theory by boyplunger56
