I'm pretty sure the trainer in the pro bending arena was someone from the 100 year war, I recognized his name.
I missed the episode today D: saw 5 secs of Republic city on fire and I was like NOPE! and turned it off Here is my theory on Amon.
http://www.reddit.com/r/TheLastAirbender/comments/v50yh/official_episode_10_turning_the_tides_reaction/ Enjoy
l'm just gonna go ahead and spoil the whole thing right now. I think the end resolution is that everyone is going to be able to bend any element even if they are born non-bender. It's a win win. And it makes sense. Tell me whatcha think.