An interesting base concept. The Sidereals were the most powerful Exalts after the close of the Primordial War. Therefore, if the Usurpation occurred, the Sidereals would have been deposed by the joint efforts of Solars, Lunars, and Dragon-bloods. The requirement, obviously, would have been the Sidereals roosting in Creation rather than Yu-Shan. Still, it is an interesting exercise.