Interesting. I have a partial Sugg genealogy that was compiled by Merrill Carter of Dickson, who was the son-in-law of William Jesse Sugg of Dickson. William Jesse was my great uncle. William Jesse's father (my great-grandfather,) was Nathan Rufus. His father was John Sugg, listed in my records as born in 1807. We are pretty sure this John was born in Bedford County, and I think he moved to Dickson county about 1850.
Now, one of John's children was named William (in my records.) I have no date of his birth. One of William's children is listed as "Zeb." This is similar to your lineage of S. William and Zibalon. I know there are some inaccuracies in my records, so this might be a match. The dates and places seem right.
Another possibility - there was a William Sugg living in Bedford County in the early 1800's, along with a Timothy, a John Harbert, and a Harbert (see ftp://ftp.us-census.org/pub/usgenweb/census/tn/bedford/1820/pg0041.txt.) Some think Timothy was the father of John Sugg (my gggrandfather,) but we have no proof. Anyway, there is another William for you to consider.
My records are typewritten, having been compiled in 1960. If you have access to a FAX machine, I will fax them to you. I am sure you would find them interesting, and probably helpful. (I am in the process of converting these into electronic form, but don't hold your breath.) You can send your FAX number to me privately via e-mail, if you wish.
I'd be interested in your data, as well, although my genealogy "time allocation" is on the minimal side these days. Not for lack of interest, however.
We are trying to nail down the father of John Sugg, in Bedford County. Any information concerning this would be information I would be VERY interested in.