Burrell's brother Bennett (my GGG Grandfather) married Olive's Sister Anna. I have a picture of Anna, and I do not think she looks Native American. Lots of Musgraves lived in LeFlore County - which, by the way, was in the Choctaw Nation, not the Cherokee. Many other families who are related (Vincents, Maxeys, Brownfields, etc) also lived in Pulaski County and made their way to LeFlore. Many additional ones ended up in Carter County around Ardmore.
Who is Carlock? I have all the others in my tree but not him.