One idea I kind of want to being is maybe some of the Amazons do leave the Island but come back at a certain time. Some come pregnant or others being tech. This is if Dc doesn't being back Magic Sphere. I mean if you want the Amazons to be advance. One reason would have to be there has to be something in the Island. Like Maybe the doomgate left some monsters on the Island. Which is why there needs to be quicker weapons