The third stanza introduces a new segment of the essay key terms room’s occupant; lodged in the text
These two phenomena are not necessarily the same. Repetition can be a good thing. Sometimes we have to use our key terms several times within a paper, especially in topic sentences. Sometimes there is simply no substitute for the key terms, and selecting a weaker term as a synonym can do more harm than good. Repeating key terms emphasizes important points and signals to the reader that the argument is still being supported. This kind of repetition can give your paper cohesion and is done by conscious choice.
Finally, you come up with Version 3, which is a stronger thesis because it offers a sophisticated argument and the key terms used to make this argument are clear. At least three key terms or concepts are evident: the contrast between river and shore scenes, a return to nature, and American democratic ideals.