I can see we have some major difference in the way we're looking at this William McCreight.
Thomas, James and Mary Elizabeth are clearly children of William and Polly Mann. The Fairfield Co documents could not spell that out more clearly.
1) Thomas, James and Mary Elizabeth were described as grandchildren of James Mann in the guardianship papers of 1825.
2) Elizabeth Mann died intestate 9 Jan 1843. Distribution of her estate was made 28 Feb 1845. Item 3 reads “To the children of Mary McCreight deceased, viz Thomas McCreight, James McCreight, and Mary E Logan widow of J. W. Logan each 167.76 ½” Step children would not have been considered heirs.
I don't understand the belief this William connects to Drusilla Brady. I don't doubt Drusilla married a William, but was it THIS William? There is no indication that this William had any connection to Pennsylvania which is where Drusilla was from, correct? Based on what you have put forth I imagine you think William is a son of James, but once again, I don't see how William of Alabama and Louisiana connects to James and Pennsylvania. Are there papers out there somewhere that show a connection?
There is a post, I believe on genealogy.com, that says the following.
"William McCreight, born in 1787 in Ireland came to South Carolina in 1792 and applied for citizenship on Nov. 16, 1813 in Fairfield Co. He was married in Fairfield co in 1814. Thomas V. McCreight was born to this union. He then married Margaret Stoudenmire and had the following children: Jan McCreight, John George Stoudenmire McCreight, Matthew McCreight, William Ray McCreight, Rosanna McCreight.all born in Al."
I may try to contact this person and find out where the information came from. I think I can check whether a William McCreight became a citizen in 1813 at the Archives. Perhaps there is information with the citizenship papers that would give clues to his origins.
There is also a World Connect tree or two that says William and Drusilla had three daughters named Jane, Mabel, and Martha. Jane married Jared B Evans. In a history of Jefferson Co PA she was described as a niece of Benjamin McCreight of Brookville. Another niece was Jane McCreight.
On a site called tombstonehopper (http://www.tombstonehopper.com/html/dec2007.html
) is the following.
Plot: near Col. Wm Allen's flat grave
Martha McCreight, was born in 1816 in Indiana County, PA, where she lived with her parents until her father's' death when she was 7 years of age. About 1823, she came to Brookville to the home of her uncle, Benjamin McCreight where she resided until the age of 16 years.
She became a teacher in the subscription schools of Jefferson County when she was 16, and in 1860, she began teaching in the public schools. Her career as a teacher included nearly every term of school for until the end of the school year in 1893. Having taught school for 50 years, she retired in 1893, going to DuBois to live with her niece, Mrs. Bell.
Martha McCreight died May 13, 1898, in DuBois, and was buried in the Brookville Cemetery.“
I don’t know if there’s any way to prove William and Drusilla were the parents of Jane and Martha, but the Fairfield Co records, in combination with the Autauga Power of Attorney, certainly prove they weren’t the parents of Thomas.