Yeah I guess that would make sense.
It does seem like there's some confusion about what the Avatar state actually is, since it was originally described as allowing access to past avatars' experiences, buuuut Korra can apparently still use it as a powerup without having that connection.
I guess it makes sense that she still gets extra power from Raava while in the Avatar state, even though the connection to the past Avatars is gone. After all, Wan was able to go into the Avatar state even though he was the first one.
It's a whole new avatar cycle, I suppose.
That's true, too.Plus, what Amon was using his blood bending to block off their spiritual path ways (to cut off their energy). Korra was just re-opening them. I don't really think that's the same thing as knowing how to do the reverse. What Amon was doing wasn't the same as Aang? I think Aang was actually energy bending.