I am a descendant of William Dotson and Elizabeth Baumgardner. I have been trying to determine if Elizabeth was John's daughter or niece? Elizabeth was born around 1817 in NC. but I noticed she wasn't listed as a child in your findings but everything I find online about her says he was her father?
I see its been a few years since your original post...have you found the answer to your question about Mary? From what I have found, the family moved quite a bit between NC (The Trade Area), Pike, KY and Johnson, TN. I have yet to determine her maiden name or date of death.