Versus Battle: The Dragonborn vs. The Inquisitor

Because he's dead.

Source?

Yes.
One of the big rules of fiction is unless you see the body, chances are the person is still alive.

I'm a little confused of what the actual point of this poll is. Of course the Dragonborn is more physically powerful than the Inquisitor, since Bethesda is more about player empowerment, versus Bioware's preference for story and characterization. Obviously the hero of an over the top heroic fantasy would be stronger than the protagonist of of more realistic one. It's unfair to judge the franchises on those terms, since they have completely different aims.

No one has mentioned the Inquisitor can open a Fade rift and send the Dragonborn to keep Corypheus company?

And the Dragonborn will crawl out the Fade and ready for round 2. Come on, the Dragonborn has traveled to other realms before and will likely find his/her way out. Besides, the Dragonborn will use the Ice Form shout to paralyze the Inquisitor, and close in to critical strike before the Inquisitor even uses the mark.

Speaking of demons... Who would win in a fight: Dragonborn or the Inquisitor vs the demon, Zarathos?

Here's a link for Zarathos (in case you don't know him):
marvel.wikia.com/wiki/Zarathos_(Earth-616)

I don't personally think it's a viable comparison.

Regardless of how they're constructed, both characters are meant to be roleplayed to an extent and how powerful they are depends on us as much as it does on the narrative (and the problems in the narrative aren't always solved by brute strength or power of badassery ).

Inquisitor can be solo-played as well or have a useless squad, so I can imagine having an Inky that literally carries the team on their horns all game without as much as breaking a sweat, as well as roleplay a Dragonborn that gets ridiculously lucky throughout the whole tiff with Alduin. Or vice versa.

I have to say though that I find the argument that Dragonborns are more powerful simply because they do stuff on their own as... a bit preposterous, really. Nevermind Powers Of Destiny (TM) and being the Chosen One (TM) or Power Of Convenience (TM) - there are so many powerful artifacts and forces that one can get/steal/be granted and deals with Daedric princes one can make, I think it's hard to argue that they're carried just by their power alone... well, unless somebody roleplays like that, which - again - kind of the point.

It depends on the arsenal that can affect GR. Such as a Azura's Star can seal the essence of GR by using either the Soul Tear shout, or a powerful weapon that could soul trap him. Other than that, I'm not entirely sure.