@Hasumi_Emi:
Yes, but her ability to talk to the Sea Kings plays a huge role in her being the "weapon", and the Noah is meant to be pulled by Sea Kings controlled by Poseidon. So likely it is intended to be believed that Noah is part of the Ancient Weapon. Especially with the Sea Kings asking each other if it "still works" and wondering if it can be fixed. If the Noah was simply a giant ship, it seems to me that it wouldn't matter if it got badly damaged or even completely destroyed. Just build another giant ship. But instead, it's very closely linked to the "ancient weapon" and it is incredibly important that the ship not be harmed.
It's obviously some sort of ancient thingie, but no it's not one of the ancient weapons.
Shirahoshi is the weapon because she has some influence on the giant sea monsters who can cause havoc if under the wrong influence.
Also we already have a boat with Pluton.
–- Update From New Post Merge ---
@Hasumi_Emi:
The city of Water 7 IS the ancient weapon, Pluton. Nobody knows where it is because the city has sunk so far into the sea since it was first created. When Iceburg finishes his plans to float the city, they'll discover Pluton somewhere below, underneath all the buildings.
Pluton is under Alabasta…
that's like the entire plot of the Alabasta arc, that Croc wants to gain control of the country then unearth the Pluton.
It would even tie into the incredibly improbable idea I have that the "ancient weapons" aren't weapons at all, but means of transporting large numbers of people at once for whatever reason.
No they're weapons.
The Pluton is a battleship, otherwise the entire plot of Water7/Enies Lobby and Alabasta make no sense at all. It's not just power hungry people like Crocodile and Spandam expecting a battleship, it's the people who literally have been passing down it's blueprint and keeping it hidden that are calling it a battleship.
Like that's it right there duder. Tom, Iceberg and Franky (and all of the preceding shipwrights that were passing it down until Tom got it) had the plans of the ship. There's no debate that it's a battleship if those people refer to it as such.
And I already explained that Shirahoshi's a weapon because to control her would be to control the sea kings.
The whole time I watched the Fishman Island arc, it seemed like Noah was intended to be the means that Fishman Island/its people would be taken to the surface to live with humans some day, rather than being intended to be a weapon of mass destruction.
As someone said, Noah is not the weapon.
Also don't really know why they would come to be known as weapons of mass destruction,
Uh how about the blueprints of Pluton lol.
beyond the World Government's insistence that nobody learn about the Void Century as learning about what they did so long ago would turn the world against them and remove them from power.
Yeah except this is the boring outdated theory of the Void Century. The updated one is that it's a mixed bag of controversy, that there really are dangers inherent in what got locked away by the WG.