Take that like Ozai escaped from the prison (after six months), and took backhis throne and bending (somehow). Sokka losted his sword, did he? So he got a new sword. And Zuko wasn't able to lighting because he felt ashamed. After he let it go, he was able to lighting. okay, we couldn't see it in the cartoon. And why are we didn't see him lighting, after he run away from the palace? Well, it would be a little bit dangerous, and it can't be unseen, if someone start to shoot lights from his fingers, am I right?
Well, tecnaclly, Aang can try lightning, metal and blood bending too, right? Plus, he got to do the beding-bending at the end (y'know, when he bends ozai's bending outta him?) He just didn't try, but he could do it all
Except maybe metalbending. Not even the Avatar is cool enough to bend metal, like Toph., I guess.
yea, i know i was stretching it but i needed the rant to be short and sweet and Azula has had lightning from the start.
plus i think now that he has come to terms with his dad he should be able to do the lightning