DD has shown improvement in a lot of areas this season. I remember he said in an interview that he watched a lot of game footage of DWade over the summer. Well, now that explains it!
He's only 23 and I think he still has a lot of room to grow. He hasn't reached his ceiling yet.
Other than Wade, you can argue that Demar is as good or better than any of the guys you listed so I think the argument for him being second in the east is reasonnable, if not all that impressive.
"When Life gives you lemons, you clone those Lemons to make super lemons!"