Okay, remember that song Iroh sang in the end of season one?
Verse 1. Winter, Spring,
?????????????????????????? Summer, and Fall,
???????????????????????? (Repeat)
Verse 2.Four Seasons,
???????????????????????? Four Loves,
???????????????????????? (Repeat)
So far in this show I've realized that everything that happens will most likely be brought back and has a purpose. In the most recent episode (Tales of Ba Sing Se) Iroh sings to that crying boy, something about a brave soldier boy. We find out later that it's his dead son's birthday and he takes out his son's picture and sings the song again. Check it out, a purpose!
So I'm saying, There's four nations, four seasons (as mentioned in the song). We already know that Firebenders' power increases in the morning and Waterbenders' power increases in the night. So could that be true with seasons? Firebenders are more powerful in the summer and Waterbenders in the winter? Which leads to the next thing, if this theory is correct, then when are Airbenders and Earthbenders most powerful? Spring or fall? What do you guys think?