I think the point there is that Captain is a low rank in military hierarchies. Consider that of the three people you mention, the only one who was not frequently having to deal with the mess made by higher-ranking officers was due to being beyond their ability to conveniently convey those orders to her...There's some people outside by names of Kirk, Picard and Janeway who would like a word.
I'll hold your beer.
In some rank systems, Captain is even a role - that is, there is no rank called Captain, but the officer in charge of a vessel is referred to as the Captain. Which is interesting, in the context of this thread