Denny/Izzie...Grey's Anatomy spoiler.....?

At first I was so happy that Denny was back and I kept thinking maybee there's some crazyy twist where he can be alive? But now she's just talking to herself, blowing off everyone, and taking screen time away from other things. Like all that drama about mer and der? Did everything magically become a fairytale for them? I love greys but im getting bored fast. I think shonda is gona drop something huge on us soon maybe to do with izzies condition or something in addition to it? Idk!