Anyone have any ideas? Perhaps Koopa originally was going to give someone else a taste of the "primordial" setting?
Also, I've always found it weird how, when Koopa is entering the room, a voice shouts, "What a lousy chamber! Ever since Koopa took over..." then Toad says, "And you, Koopa, you're a lousy leader!" Perhaps both of those were said by Toad, but when set right next to each other, they sound very different. If that was someone else, that would support my theory that Koopa was de-evolving two convicts.