A Garlean race may or may not have happened. Garlean history is them fleeing and isolating themselves from the other races because they were majorly discriminated against and persecuted for being non-magical. That kind of history could very well have not happened in the First. The First may have caused them to go extinct, or turned them magical, well-before the Flood. Hell, non-magical race of people may not have existed on the first to begin with. Is there even a single Hrothgar on the Source? I've only seen one Viera on the Source, and that was Fran.