What would have had to happen for Odoacer to put another, different "shadow" Emperor on the throne of the Western Roman Empire? If this happened, would it be possible for a shadowy line of Roman Emperors to have continued until a time when they were powerful enough to step back out of the shadows, as occurred in Japan in the 19th century? If this doesn't seem likely, what POD after the first Sack of Rome by Alaric would have made it possible for a separate line of Roman Emperors to remain in the West?