Here's the thing about the whole "can't be rezzed in lore" or "rezzes in-game are just revivals of passed-out comrades."

http://www.wowhead.com/quest=11638

Pay close attention to the closing text: "Thank you for freeing his spirit from Kaganishu and returning with his remains. [...] And now, I will return him to the living where he belongs."

He's dead. So dead you brought back his "remains". Like his spirit, the ghost, asked you to. And then the shaman rezzed him, or "brought him back to the living."

Now, one can say this is just an in-game thing, but why couldn't they have chosen different words to keep it open to things like reviving those with only a barest breath of life left? Remains, back to the living, his spirit. It's very clear that this shaman rezzed a very dead tauren. And there are a couple of other in game examples, too. Another ntoable one happens when players fight the Lich King in ICC.

I prefer to think that yes, we can ressurect the dead, but the circumstances required to do so must be very specific. Perhaps the dead must want to come back. Their body must be fresh of course, we can't revive Mankirk's wife after she's been rotting in the sun all day. Perhaps some injuries are too grievous for even skilled healers to mend.

Something to think about.