The idea that the Navajo would submit to a white leader because they're unable to govern themselves is disgusting. It's a Euro-American fantasy and says something about the creators' real attitude toward Indians. The Navajo are great for providing local color, it seems, but they can't be the protagonists of the story. They're sidekicks--faithful Indian companions--not stars.
For more on the subject, see Comic Books Featuring Indians.
Below: Kit Willer, Kit Carson, Tex Willer, and Tiger Jack (rear). "Yes, I'm only fourth-billed in the comic, but what do you expect? I'm an Indian."