What is the relation between these so called “disgressions” and the main narrative in beowulf

faithful servants eumaeus and philaetius:

his ragged vest then drawn aside disclosed the sign conspicuous, and the scar exposed: eager they view'd, with joy they stood amazed with tearful eyes o'er all their master gazed:

these servants know ulysses by the scar he got when he was a child - so when he showed them the mark, they immediately knew this is truly their master and they hugged him, finally starting to believe his words.

b. brooks wrote about the same type of neighborhood in which she grew up.

what lesson are you referencing?