Gunfight at the OK Corral

Sidekicks have been present in history from Don Quixote's Sancho Panza to Batman's Robin. Typically, they are considered to be friends of the protagonist (hero) of the story that aid in completing a task yet still remain subordinates.
In typical “sidekick” films such as The Searchers, Martin Pawley follows Ethan Edwards in the goal of finding Debbie and is easily considered his sidekick. In Red River, Matthew Garth is the “cowboy in training” throughout most of the film, taking direction from Tom Dunson. In both films, the supporting male character has qualities of a sidekick.
In the Gunfight at the OK Corral, however, Doc Holiday refuses to be considered a subordinate to Wyatt Earp. Although they stick together until the fight at the end, both verbalize their resentment towards the other. Earp says, "I never needed anything in my life and I sure don't need Doc Holiday." Doc Holiday later explains why he is accompanying Earp, "I only got one debt in this world and I don't like owing it to you. I came to bail you out." Typical sidekicks accept their position as a subordinate. However, the fact that Doc Holiday is there because of his sense of duty in being a man (a quality attributed to an alpha male cowboy) weakens the idea that he should be considered a mere sidekick. Doc Holiday continues comparing himself saying, "You and I are pretty much alike actually. Both with a gun." Later in the film, Earp says, "We're not a team; it's just a case of square deals." Although in the beginning it may seem as if Doc becomes Earp's sidekick, both of them remind the audience that each of their motives is independent of the other. Putting both of these characters together demonstrates the clashing of authority; what rules the town? The law or the outlaw?