Aside from the frustration here, I'm rather fascinated by how everyone is using the typical "creative/mythos" card to identify someone as an N. ... just sort of watching it all unfold.
Well to be fair, I probably made my claim sound stronger than it really is for rhetorical effect. I could definitely see ESFJ, though I still think there is more evidence for ENFJ. I'll address your points individually.
I think if people accept (1) the entire CULTURE speaks in mythos ... which means the SJs will do so as well regardless of lack of N, and (2) then compare Neytiri to Moat (the true intuitive here, and far more ENFJ), the contrast will show a difference in approach and thinking. It is just SJ thinking/processing applied to N-style topical matter.
It's not just that she spoke in mythos like everyone else...it was one of the most important things to her personally. In his video logs, Jake says that "she's always going on about energy, and how it's only ever borrowed, and must be given back." (That's not word for word, but it's the idea.) You've compared her to Moat, but all that proves is that she's not as intuitive, or is not intuitive in the same way, as her. For completeness one would have to compare her to known sensors as well, like TsuTey. People are calling him ISTJ here, which I basically agree with, and you can see that the differences between him and Neytiri are fairly great. He would have killed Jake on the spot without regard for signs, and even after the spiritual leader had admitted him to their "clan" for training, TsuTey was wary and distrustful of the wisdom of Moat's decision. Neytiri is much more "spiritual" than him, which would lend some credence to an N over S typing, or at least balance out the comparison with Moat.
Maybe my experience with a lot of religious ISFJs who "speak faith/mythos" all the time and look for signs constantly in the environment, just as Neytiri does, is what is giving me a different view on this one. Religious SFJs can easily "talk the spiritual talk" but they do it in different ways than N's and the underlying attitudes are different, as well as how they respond to signs.
Note that Moat is far more flexible in her sign interpretation than Neytiri. With the S types, as soon as a sign comes into being, they tend to take it at face value and in a predetermined fashion. N's are far more fluid in their handling of signs.
Since when is "flexibility" a sign of N? Isn't that one of the signs of P vs. J?
The biggest: Jake, once he became Turok-Mak-Toh, flipped from hero to villain and most of the SJ culture did not even have to think twice about it; the gods had spoken. The N's, especially Ni people, I think were far more aware of the implications of his actions and the choices that went into them. When everyone turned on Jake at the tree, who came back to him and let him go? Moat. She was the one who looked past the sign (Jake "using" the people) and saw his heart and heard the earnestness in his voice. Neytiri wasn't any better than the others; first she felt violated ("I trusted you, because you did and said all the 'right things' to show you were one of my people, and now I find that you knew my people would be destroyed" and then "Get away, you are not one of us.") How much more SFJ can you get?
I don't see how her behavior in this instance can be definitively interpreted as SJ and not just FJ.
First of all, are you saying that Moat was the only Ni individual in the tribe? Because that is the implication of your claim that her behavior (going back to release Jake) separated her as an Ni user from the rest of the tribe.
Second, Neytiri was offended because she had been decieved by Jake's affection for her into believing that he was an honest advocate of their interests. When he hinted that he may not have been completely honest, she took that as him betraying her. All that says is that she so closely identified with her group (Fe) that she couldn't separate their interests from her own.
SJ's tend to see signs and behaviors as facts; N's see signs as indicators and fluid at that.
Again, look beyond the fact she can speak in mythic language (which is external and learned) and look at how she actually behaves and what she values.
Again, it appears (to me at least) that she values her fellow people (or...um...aliens, Navi, whatever) above all else. All this is indicative of is Fe. It is also apparent that she personally values the mythos, because she talks about it a lot. You would expect that she would have a simpler and less personal way of relating to it if she were SJ, sort of like TsuTey does. But she appears to derive a kind of personal pleasure from talking and thinking about all of that "energy" crap. I mean, she was going to be the spiritual leader to take over after Moat, so you'd think she had some propensity for it. She was going to be the shaman.
Also, she was more than willing to break the "rules" in order to be with Jake and not with her betrothed. This, though arguably insignificant, could point more to N than S (or at least SJ.)
So I don't know...I could see SJ, but I don't think these things you've mentioned are great indicators.