So.... the revelation at the end of this episode fits perfectly into this theory on the IMDB board:

http://www.imdb.com/title/tt1119644/.../208276762?p=1

which is even more amazing if you consider that this theory was written BEFORE the last episode. So I am willing to accept this as the explanation. Also, I am 'pleased' that finally someone important died. I think they should have killed off Broyles in that one episode. They should have killed off someone important in the first episode of the season already, because that would have made the Observers much more menacing.