As most of us are probably aware an episode description was released for "The Aftermath", which comes out this Saturday, May 19, 2012:
Korra begins to suspect that an ally is working for the Equalists.
What that means to me is Hiroshi Sato is working for Amon. I have done a previous blog of my slowly developing ideas, but now it is time that, after learning more about him and his daughter, I use the facts to form a hypothesis.
Eliminating other theories
Tarrlok, although seeming and being seen as that type of person, would probably not risk his bending nor glory. On top of that, I don't see him to be that "close" to Korra as to being her ally; he is more of a colleague. So I believe it would not be him.
She is madly in love with the best friend of the most "anti-anti-bending" person in the Avatar world. To add to that, she is a huge fan of pro-bending, and now that the Arena is ruined, and the games are ended, it is more possible that she is angry with Amon. I don't see her going to aid him anytime soon.
Hiroshi Sato, although not a close ally of Korra's, is a non-bending, rich gentleman. Although as far as shown he loves his daughter, it is still possible, seeing that in his eyes there is nothing major to lose, that he joins Amon. This, too, would be an important moment if Makorra, which is obviously bound to happen, seeing that no Nick show breaks the heart of their main character, is to override Masami. That is if Mako breaks up with Asami, then Korra is open, and they are both in love.
And although not the longest of blog posts, I hope you have enjoyed my theories, and I look forward to seeing your opinions in the comment section. However, please remember to be polite and respectful towards others and their opinions.