To be fair though, besides Nog and Fedor, what submission aces did Coleman really fight? I mean the best I can figure is Allan Goes, but obviously Goes didn't get a chance to work any submissions, he got sprawled on and kneed into oblivion. So I mean when your resume includes guys like Igor Vov, Shoji, Fujita, Don Frye, etc, it's no great feather in his cap to say he wasn't submitted by anyone other than Nog or Fedor.
I agree that Fedor is likely the better range striker, I just see DC closing the distance and being very effective with his clinch striking and grappling, as well as his top control. Fedor's GnP is legendary, but I don't see him getting top advantage on DC, who clearly isn't as clueless as a guy like Randleman (RIP) was with BJJ and would be unlikely IMO to get swept or reversed.
For me, Fedor needs to land a KO punch to win (which is entirely possible), while I could see DC winning by KO or by outfighting him to a decision. Obviously it's all hypothetical but I would have no reservations putting my money on DC here.