I was the one who brought up the term "offensive flair" in my last post.
I just very rarely see DD making decisions with the puck on the offensive side of game that make me go "wow, that was a nice and creative play". He isn't really that good at walking the line or blasting puck from the point either - your usual qualities of offensive d-men.
He usually opts for the safe play. Some of those decisions demonstrate his great hockey IQ (which manifests more on the defensive aspects of the game), but DD just hasn't shown that he brings anything substantial to offensive situations. especially PP. And you can't be a true #1 if you can't quarterback a PP or be a constant threat from there with your shot. He had some ample time on PP units this season, and measily 2 goals to show for it. You have quite handily left goal totals out of your stats comparisons.
DD has a good outlet pass and is certainly passable on the offensive blueline, but nothing to write home about when compared to say Kronwall or Zidlicky. He just isn't an offensive force, which again, is completely ok considering how well-rounded, smart and solid he is generally. Like I said in my earlier post, he is already a great middle pairing guy.