@Waterbender
You just ignored all but one point of my post. I'm not going to take the time to respond to you when you ignore the other things I've said.
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@MasterBender
1. She doesn't need to. To her, they've been friends and nothing more since day 1. That'd be completely unnecessary.
2. A. We don't know what the other avatars had to give up. The 7th gate isn't about love. It's about attachment. The people that they married obviously weren't the attachment of those avatars. There is no evidence in the marriage of other avatars argument. Heck, according to "Stories Before Aang" the waterbending avatar became a full-fledged avatar long before he met his fiance.
So what you guys need to prove is that Roku's attachment was his future wife.
B. HIS attachment involves love. That's incidental. WE DON'T KNOW WHAT ATTACHED THE OTHER AVATARS TO THIS WORLD.
C. That would make sense, if he had gone all the way with the transformation. Remember, when Azula blasted him, the giant, glowing, space Aang was still in the process of giving him the power. He hadn't completed it.
D. I think what he meant was, even if he wanted to, he couldn't go into the AS because of what Azula did. Plus, I doubt he'd admit that he can't do it because he doesn't want to give up Katara. Yeah, that wouldn't make her feel like crap.
3. Ok, so she could have read his palm or something that doesn't explode.
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@tomtitan
1. Actually, in a good number of them, Aang ran away before the fight was over.
2-5. Who knocked who down during CoD by shooting a huge blast of fire that a bunch of green crystals failed to block? Last time they dueled, Zuko one-upped Aang. Give Aang all that other stuff, if you want. Zuko still topped him and that just shows what a very powerful bender Zuko is.