About half the time I go to Gunmar to sell stuff, he tells me "It's no Warmaidens, but I have pretty good stock." Could it be that Gunmar is conspiring with the Vampires to put Warmaidens out of business? About half the time I enter Whiterun there is vamp attack right in front of Warmaidens, and I have had to reload a number of times because Adrianne gets ashed. Coincidence? I think not!

Plus, how is it that Gunmar has all this info on where non-pure-blood vampires are hanging out? Could it be he has a business arangement with the Volikhar Clan, much the way Maven Blackbriar has an arrangement with the Thieves Guild?

And how do the vampires seem to know where I am going to next in my quest to read the elder scrolls? Who tipped them off that Serana and I were heading to the Ancestor Glade?

Watch out for Gunmar. The trolls you buy from him will probably turn on you at some point!

Daroska thinks cap_and_gown has been possessed by Reman III.

Maybe. I don't think Bethesda planned this far ahead

And if you look really closely, you can see Gunmar in the background during the last Star Wars movie. You know, just before the clones went homicidal. Just like the trolls.