Exactly! Listen, what you are thinking of, Lurkily, is the Isola that we know, not the Isola that ghosts in the Sun Dial room knew before their city was destroyed. They don't actually say what happened to the villagers of their city. Isn't it possible that the naturalists fled to the west shore and took up residence there but at some point in time discovered that magic was taking place and left only the five kids behind?