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I don't think Tarrlock is working for Amon, either. At least, I don't think it's that simple. Also, I saw on another site where someone pointed out that Toph created a new form of bending when captured and Hama did the same. Maybe it's possible Korra will do this, or at least overcome her airbending block.
All things die, Anakin Skywalker, even stars burn out.
So this is how liberty dies....with thunderous applause.
Those without swords can still die upon them
The world is a mess and I just need to rule it.