Awww....I understand, but I don't agree about Denny/Izzie. I think it was a pretty effective way of showing that in order to become a truly quality surgeon Izzie was going to have to let go of the memories and guilt that she had regarding Denny.
Plus... any excuse to get Jeffrey Dean Morgan on screen is a good excuse.
And very, very interesting about Owen's sniffing. Hmmm... I'm going to have to pay attention to that. You're right, that would make sense.