Unnamed Ex-Slaves of Carothers McCaslin

The three paragraph introductory to Go Down, Moses says that "some of the descendants" of the former McCaslin slaves are named McCaslin (5), but curiously no such characters appear in the rest of the story. There the family name of the many people who are descendants of Carothers McCaslin and his slaves is Beauchamp. (There are some of these descendants named McCaslin in The Reivers, published twenty years after Moses.)