Nope you're still taking DLC into account (KotN)
mkay ill go as basic as possible.
Dovahkiin fights Dragons, and those battles can last for a long time. CoC enters oblivion gates and take on An ARMY of Daedra. while we can see a small contingent of guards defeat a dragon (first dragon encounter anyone?) and the Daedra were able to destroy Kvatch.
so
Dovahkiin = Slays Dragons that a small group of guards could defeat
CoC = can single handedly defeat an army (on their own turf mind you) Capable of leveling an entire town