+4
Intriguing review @Nestorio_Milklos, going with a scientific analysis of the film regarding Inculturation. Rather liked that.
You mentioned that: "secondly I didn't like Dunbar's total lost of identity assuming completely Sioux culture and believes and not preserving anything from his."
I actually find it quite easy. When I was a child we'd visit family in Canada for a month during the summer. When I'd get back, I'd have a french canadian accent. And I've seen it done with people in different areas of the U.S with the changing of accents. While I do know, including my mother who has been a U.S. citizen since around 1958 still has her french canadian accent.
On this much smaller scale, we can consider Personal Choice, in regards to abandoning one life and immersing one's self in another since this is the situation at hand.
Dunbar easily fits that. It is expressed when he is asked why, and he responds "I want to see the frontier. Before it's gone."
We're given examples of the kinds of people he wishes to leave behind and in the Sioux he sees the frontier and discards his former life for this new one. Which the film shows us.
Retaining their previous life, for me, was the character of Stands With Fist. She was raised by them, but is NOT one of them. There was all kinds of inner conflicts and I found McDowell doing a splendid job of trying to conceal them, while letting us in on what was beneath the surface.