Which goes back to Dave's "love wasn't seen in his future" stance. which means the airbenders die off because Aang is the Last Air Nomad with air-bending DNA. Mike and Bryan said that it's a mixture of genetics and... something else. Basically they didn't really thing it through, so some can bend and some can't.

Before I get to Wiselad:

Space, Airbenders can be trained. Fanfics are the only place where I've seen a "rule" that you can't learn a type of bending unless you are a decendent of that nation. Sky bisons taught people once, they can do it again.

Now, onto Wiselad.

I'm not going to go back to the Aunt Wu argument because, as I said, it could be over turned with some VERYcreative writing. Thus, it is plausable and I have said that the guru was, in fact the biggest thing. That's not to say the Aunt Wu stuff isn't evidence in its own way, but it isn't the biggest thing, which we are discussing here.

I read your post on the last page and it brings me back to when the guru said "forgotten." If he had just said "let it go", they could weasel their way out of it. However, he said that it had to be forgotten. Plus, with the fate of the world on the line, don't you think that a wise old guru would spell it out for Aang as best he could?

When Aang threw up his argument saying "I can't let go of Katara. I... I love her." and the other things he said, the guru didn't say, "Relax, young avatar, you only need to let go while you are in the AS." Instead, he re-emphasized that he had to let her go.

Now, onto "The Headband" and the NaDD kiss. Remember, the thought chakura was sealed shut by Azula's lightening. There's no reason for him not to feel his attachment.

The post that I quoted actually makes more sense than everything that everyone else has tried to argue. However, you are under the assumption that he will need it again. He may need it, he may not. However, I'd have to imagine that he'd try to use his natural amazing powers over his uber powers that force him to let go of his strongest attachment.

Now, before we bring up Roku, remember a few things. 1) We don't know what it was that he gave up at all the first time he went into the AS (this is going by the safe assumption that he used it before he fought Sozin).

2) We don't know what it was that he gave up (if he had to do it again, maybe he never formed another attachment that strong, but I doubt that) when he fought Sozin. However, if there's any evidence that Ty Min was his attachment at the time, there's just as much that Sozin was his attachment at that time.

Here's a question for you: The only time that AtLA has been as objective as you are assuming it to be is during "The Fortuneteller." Remember the plans for the DoBS invasion? There was never any absolute proof that a solar eclipse definitally stopped firebending. In the most literal of terms, it was assumed. So, why would the show suddenly change to something that is completely objective?