Well, could it be because she was trained to be a dutchess he whole life and Uri was training to become a knight? ╮( ̄▽ ̄)╭ People are just so used to that idea that they can't come around... I'm not sure if Uri is or isn't fit to be a duke, but he gives off the feeling he won't be happy as one...
I keep feeling that Uri isn't fit to be a duke. People still listen to her and expect her to be the head of the family, he doesn't want to either...