[Lucid:]

I thought it was the councilman at first, since he and Amon were never in the same place at the same time. I thought he used bloodbending to chi-block benders from the inside. But this last episode obviously killed that theory. :P
I think Illusion's theory is pretty good. And it would be a really interesting way to tie elements from the first series into this one.

I'm really disappointed that the season is only 10 episodes. I'm glad the finale is an hour, but they definitely could have paced the show out a lot slower and made more episodes. I know they were only originally scheduled for a small number of episodes, but it was very quickly apparent how popular the show was going to be. I hope they make at least a few more seasons of it.

Also: Who thinks Meelo is the best character ever?! >3<~