In ISWF, the chapter Brothers, when they confront Augus, Jack realises that when Augus refuses to surrender his Kingship, it's because he can't, though Jack doesn't know the reason - stubbornness, something else? A reader familiar with the way fae personalities work as written by the author can recognise that it's because Augus' centre is dominance; his very nature means that he really cannot surrender.
