Iroh is going to teach Aang to firebend. I wouldn't want any other teacher to do this other than Iroh. He helped Aang Co. at the end of freeing Katara as well as try to get him to learn the final stage of Avatar state. How awesome would this be... Aang and Katara thinks they are obligated to free Iroh from capture since they won't kill their uncle (Nick show).

Unfortunately Iroh is still in the Earth Capital and is being held prisoner by Azula so he can't be rescued.?? If Aang wants to learn firebending he will have to find someone else!