Beverly,
I don't seem to have you as a DNA match on Ancestry. I do have numerous matches with other descendants of Job & Elizabeth, including some from Calaway's line. My account on Ancestry is under jzerger, & my mom's is under Vera Lewis. Have you thought about uploading your DNA raw data to Gedmatch? On Gedmatch we could compare & see if we have any small matching segments. We could also check our mutual matches. And, you could be added as a descendant of Job & Elizabeth on WikiTree.?
Are you certain that John (who married Avis) was born in 1789? If so, he would have been 16 will William Mack Daniel was born. It would have been possible for him to have been William's father...but it would have been more likely if he was older. On the 1830 census, Avis is listed as being 50-59, which means she was born sometime between 1771-1780. If John wasn't born until 1789, then she would have been quite a bit older than him. And did you say that John & Avis had daughters?
William Mack Daniel's first daughter with his wife, Eliza Ann Melton, was named Avis Caroline, so that could be a clue as to who William's mother was. The letter that I mentioned from Elizabeth's son, William, can be found here:?
There are actually 75 pages (372-447) devoted to Elizabeth's application for a Revolutionary War pension. This letter is just one of the supporting documents. It's a fascinating read.
After Elizabeth died, William Mack & Eliza Ann moved their family to Reynolds County, Missouri. They were there for the 1860 census. By 1870, they were in Sharp County, Arkansas, & then by 1880, they were in Hot Spring County, Arkansas, which is where they both eventually died. It seems that most of the family remained in Tennessee. Because of the physical separation, I am wondering if that could be why William Mack sort of seems "lost" to many in the family. He is often left out of family research. It took me a long time to find what little information I have about him.