I would say that Kalgren’s video could be considered both ethical and unethical. You could give the argument that the video is ethical and that he just made it for fun, but you could also give the argument that the video’s intention is to point out that Star Wars is actually not as original as many people tend to believe, and that it is not as impressive because it could be considered plagiarism, because, as far as I know, no acknowledgment of the work that inspired them. As far as Star Wars, I would say that most of it could be considered ethical, but there are certain things in the franchise that could be considered unethical. Some scenes in the films are basically ripped directly from other films or shows and they do not acknowledge it at all, as far as I know.
At the very end of the video, Kalgren credits all of the films that that he samples and has them in order. So, I would say that he does a very good job at crediting his sources and that there is not really anything else that he needs to do. If we compare it to Star Wars, they do not really credit their inspirations and they just kind of just use it because they want.
One way that they used the material to create something unique is that, even though they recreated scenes from Star Wars, but they used different scenes from other films in order to do it. Despite not using any original content, they were still able to create something that could be considered unique. Even though it could be considered unique, the artist still has to rely on the fact that the scenes are really similar, if not exactly the same, in order to create the effect that the artist was going for.