One and the Same
We know what you’re thinking: “How could one person, who seemingly belongs to the Ancient Greek civilization, have anything to do with the Incans? That is a valid point that the theorist didn’t touch upon, but that doesn’t make their crazy theory untrue.
According to the OP, Megara and Yzma are one and the same. As Yzma, she fell in love with Emperor Kuzco’s grandpa, who had rejected her advancements. However, when Hercules slays his and Megara’s children, Hades comes to save the day… sort of. He actually drove Megara insane and sent her to the Incan empire, where she still retains the same taste in men.