No, because story-tellers want that (it's kewl after all). Well, you see, it happens that normal human Ygerna is much powerful than anyone else in the Div2 Universe (it is not a typo, I meant Div2 universe, not Divinity one).
Please, stop paying so much attention to the Div2 story. It's a lightweight fairy tale, just like HarryPotter's one. It is not even close to P:T, Baldur's Gate or to the DAO.
Doesn not mean it's bad btw (we all loves fairy tales). It's just... there is nothing to analyze.
