Regarding the outcast
The Tukkun way is not fighting back ever. Not even against groups that are actively trying to murder you and your family. Lo'ak is not on board with this. He thinks that the outcast shouldn't be thrown out since he was doing it in self defense. The water chief does not agree with Lo'ak's view. He sees the outcast attacking the humans as no different than being responsible for killing other Tukkun itself.
I'm not entirely sure how this view make sense since the water chief is totally okay with his Na'vi people killing the attackers to protect the Tukkun. It just isn't okay when a Tukkun does it.
The outcast Tukkun then shows up during the final battles and is mostly portrayed as a hero for doing the same thing it did before and killing humans to protect its friends. In universe this leads to nothing. I don't think the movie actually addressed what the characters thought of the outcast killing more humans in violation of the Tukkun way. The outcast's role was simply done after it help saved Jake from drowning.
My bracket looked like random picks compared to his.
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