The awards are still coming, but I would just like to say -- there's not really one person to give a special award to for figuring out the secret. I haven't quite kept track, but several people got it or near to it:
Lalaith asked me in PM if there were two Owls the Night after Mith and Glirdy's revelations.
Mithalwen voiced her suspicion and then belief that that was the case.
Nogrod included it in one of his many, many possibilities.
SpM thought at one point, I think, that there were two Owls, one false and one true. (I think it was you, Sauce, I have been forced to delete my PMs of course and didn't save all of them.) This was pretty close, since having a false seer was among my initial ideas for the game. In the end I went with two true seers, though.