On Cornelius Miller's birth date:
I realize that I must be careful here. We have three records, so far, indicating that he was born ca 1853. These are from 1910 (census), 1920 (census), and 1927 (statement to Guy Johnson). Against these we have the 1880 census, age listed as 18, and a birthdate, June 25, 1861, from a source cited as "Greenbrier Births, Bk1A, p62, L200." I have not seen this last source.
It appears, however, consistent with the 1880 census (almost), so the best interpretation seems to me to be that Miller systematically added about 8 years to his age beginning at some time before 1910.