So you would rather believe that FSA Ganon swings around a previous Ganon in his trident. Or that Ganon actually becomes the Yami no Maou so there is no soul in the trident (which is basically what it says anyway).

If you touch a trident and become a Yami no Maou because of it then the soul wouldn't be in the trident anymore. It'd be in the Yami no Maou's new body.