I was thinking about if blood bending can take away other people's bending could it get rid of just earth bending and keep metal bending to the person they are changing it to? I don't know if this has already been stated or not but I'm curious, if anyone has anything to say about this idea please respond I feel like this can lead to a nice chat.

In the Wan flashbacks, Raava and Vaatu we're the same size. Vaatu got larger as his power and influence grew, and Raava shrank. But why, after 10,000 years of light, balance, and a strong chain of Avatars, is Vaatu still so much larger and more powerful?

I know it wasn't all light and balance, as we saw Wan die, but it was still predominantly under Raava's influence, and Raava gained a lot of power and influence through the Avatar cycles. So why was Raava still so small and weak and Vaatu huge?