<p>Well none of these are of holes just things left unsaid or they just couldn't of done ahead of time but I'll try to answer your questions.
</p><p>1. The Among thing is just something they never explained, but could just be a combination of blood-bending and chi-blocking
</p><p>2. Well yes the spirits don't act with the human world and the south pole does have a spirit portal so they may of been afraid of the humans getting into the Spirit-world and opening it. Plus who knows it may of been from Tonraq destroying the northern equivalent.
</p><p>3. Because they were closed....
</p><p>4. It happened 1,000 years ago does who did know may of just thought it a legend
</p><p>5. Same could be said for the Water Tribes and Earth Kingdom Military, simple fact is the Hero needs to be the Hero.
</p><p>6. All we've been told is he was a martial artist, and I wouldn't doubt he was an Air Acolyte. Again something I would want a comic about.
</p><p>7. That's your opinion, the spirit of good makes sense too.
</p><p>8. The original Airbenders seemed to in tune to nature, Aang was the Avatar and thus connected to the planet, Tenzin was connected to his family and Air Nation culture, his kids same, the new Air Nation weren't spiritual and ended up working to help people. So why only Zaheer? Because the only living thing he cared about was his girlfriend.
</p><p>9. It was still a swamp, just with less vine, she didn't cut down any trees as far as we now.
</p>