In Sophocles' play Antigone, what is the purpose of the exchange between the Chorus and Chorus Leader?

The purpose of a Chorus Leader was to act as the
spokesperson of the Chorus. The Chorus Leader expressed the most critical opinions of
the Chorus. They also interacted with the other characters in the play, having critical
dialogues href="http://faculty.musowls.org/Sheltont/Literature/HO%28gtd%29.htm">(Greek Tragic
Drama, faculty.musowls.org).

We see one exchange between the
Chorus and Chorus Leader beginning with line href="http://records.viu.ca/~johnstoi/Sophocles/Antigone.htm">109. This
exchange takes place after Antigone informs Ismene of her plans to bury her brother. For
both the Chorus and the Chorus Leader, the purpose of their exchange is to give the
audience an understanding of the history, so that we know why both of Antigone's
brothers are dead. The Chorus waxes lyrical about the army and the battle, while the
Chorus Leader zeros in on the most important part of the history--an explanation as to
why the brothers battled each other and a statement that Zeus smiled down on neither of
their actions and struck them both dead. Because of the Chorus Leader's references to
Zeus, we know that morally the Chorus Leader considered both brothers to be guilty.
Hence, by zeroing in on the brothers, the Chorus Leader acts as spokes person for the
chorus by raising the Chorus's opinion that both brothers were morally
wrong.