Why did the prophecy fit Sazed in 'The Hero of Ages'?

The prophecy fit Sazed because he was an outcast from his culture. A gender neutral phrase was used as a description was used that was thought to allow a man or women to be the hero of ages but in fact it was used to describe a person without gender. And since Sazed was castrated he "had no gender" as Sazed put it in one of the books.