I'm sorry I couldn't respond to your March 26, 2009, posting sooner, we were out of the country. And I'm very sorry if my response to your original query was not clear. What I said (and you may take it with a grain of salt; I don't purport to be the last word on this, or any topic) was:
Nicholas Hobson (1745-1809) married two wives, (1) Jane [unknown] --possibly Jane's maiden name (or married name, if she were a widow) was also Hobson. Nicholas Hobson m. (2) Sarah "Sally" de Graffenried, a daughter of Tscharner de Graffenried (1722-1794) by his first wife, Mary Baker (daughter of Col. Henry Baker). The children of this union (Nicholas and Sarah de Graffenried Hobson) were (according to Betty Wood Thomas' compilation, 2005): Christopher (1780- ), Matthew (1782-1851), John (1784- ), Mary (Polly B.) (1786- ), Baker (1787-1842), Agnes G. (1788- ), Martha (Patsey) (1790- ), Francis (1794- ), Allen (1795-).
It's not clear to me if you mean that your husband's ancestry can be traced (through his grandmother, Anna Evelyn Hobson) back to William Hobson. Certainly there are a number of other possibilities. However, the William Hobson, son of Nicholas Hobson, who married Cecily Thomas was the son of Nicholas' first wife, Jane [Unknown], not Sarah de Graffenried, his second wife. This William Hobson was not a blood relative of Tscharner de Graffenried. [By the way, Nicholas had two children by his first wife. William had a sister whose name is given variously as Jane or Jenny; I've presumed "Jenny" may be a nickname. Jenny's married name was Smith. I have no additional information at present.]
According to most sources, William Hobson, son of Nicholas, was born in 1773 (and d. 1839). The date given for Nicholas Hobson's second marriage (e.g., in "Baron Christopher de Graffenried V His Ancestors and His Descendants 1191-2005," compiled by Betty Wood Thomas, 2005, p. 44) is 1779. [Betty is the "Mrs. Elizabeth Wood Thomas of Tuscaloosa" to whom you refer (she resides now in San Antonio)].
As I said in my last posting, neither William Hobson nor his wife Cecily Hobson née Thomas appear in the de Graffenried History by Thomas P. de Graffenried (1925), nor in either of the recent de Graffenried histories by Betty Thomas (copyright 2003 and 2005). And I have not run across the names "Archible" or "Missouria" in the Hobson information I have at hand that pertains to the de Graffenried family. I also didn't run across them searching the Internet over the past few days, including a rather cursory exam of the vast resources on Ancestry.com. I did see a "Missouri" or "Missouria" Hobson, in the state of Missouri, as I recall, but I didn't pursue it (I suppose because of the dates, but you might want to check this out).
On the other hand, James and Susannah (Mabry) Thomas, whom you cite, are in my database. They are the parents of Sarah Thomas, "daughter ofCol. Thomas, who served in the Revolutionary War" (Thos. P. de Graffenried, 1925). Sarah Thomas married Allen de Graffenried (b. 1764), Tscharner's son by his third wife, Elizabeth (Allen) Embry de Graffenried. Allen de Graffenried lived in Chester Co., SC, by the way, and died there in 1821.
So now I'm off on another tangent: A note in my database has come to my attention; it cites a gedcom file from a cousin (now deceased) from ca. 1997 which states that the death date for Allen's wife (I don't know the source, if it was provided -- I haven't been able to open my cousin's file with my current software) has to be erroneous: The date must be 1818, not 1848, "...as she died before Allen was murdered in 1821." Was Allen murdered?! I haven't found anything to corroborate this assertion. If anyone reads this and can shed some light on the subject, I'd like to hear from you!