That is because there is no specific character development or purpose or use of the character. His purpose and use is to be the evil that would get beaten by the main character, in this case Beowulf.
Answer:
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"Brennan on the Moor" is structured in this way, so that the longer stanzas can follow the tale of Brennan and give more details to the story. The shorter stanzas act as a chorus, which is usually used to come back to the main idea of a song or poem (in this case, the idea that Brennan is the hero of the poem).
