Thanks for the prompt response. I see where you are, and I follow your reasoning. It has been a long time since I dealt with the Strickland connection, and "Gadi," but I'm now "in the ball park" with you. Here's the "accepted story." "Thomas II" ("T2") had presumably gone off to seek his fortune in Anson, leaving younger brother Ithamar to care for their mother after the death of their father (T1), c1787/88.
Chapter 10 of "the Gaddy book" I cited deals with this, under the title, "The Move to Robeson County." Around 1790, Ithamar and Widow Lucy, with several daughters/sisters and their husbands settled in Robeson, along with others who moved down from Edgecombe. The move probably took place during the period of that 1790 "first census," for we believe that Lucy was listed twice, once in Edgecombe and once in Robeson. (In Robeson, Alley Ward is listed as head of household. She was a dau of T1 and Lucy and sister of Ithamar. She was possibly the widow of Rev War soldier Thomas Ward, and later married a Thompson. A co-executor of T1's 1787 will, Solomon Brown, a brother-in-law of Ithamar, is listed elsewhere in the same census --his close neighbors were Nathan and Newett Pitman, and Charity Pitman mar. Ithamar 6 Oct 1791.
On 13 Sep 1790, Ithamar of "Robinson" (Robeson) sold the 164 acre property he had inherited from his father (T1) to Joseph Pippen of Edgecombe. Solomon Brown also sold 140 acres to Joseph Pippen before joining the move to Robeson.
Per the book, Ithamar's land sale of the 164 acres near Coneto on the south side of Balahack Swamp was the Gaddy's "last tie" to Edgecombe (p. 120). "A chain-of-title on the Pippen property might yet yield more evidence of the Gaddy home. Somewhere in this area must lie the burial site of Thomas Gaddy [T1], probably unmarked and lost to time and the elements, or even to Balahack Swamp [ibid.]"
This leads us to the area along Drowning Creek (now the Lumber River), around Aaron and Horse Swamp, where Ithamar made his home for a decade. Ithamar and Charity named their first child (1792) William (conjuring the thought that he may have been named for Ithamar's grandfather -- although I have long suspected a missing brother of T1 of the same name). Ithamar's land acquisitions trace from 1794.
By 1803, Ithamar was pushing farther south, acquiring property in the Marion District of South Carolina and moving his growing family into that area, where they still survive to honor their ancestors. Chapter 11 of "the book" describes the move to SC, and cites W.W. Sellers' "History of Marion County, South Carolina...," which recalls Ithamar as "a most excellent man, quiet and inoffensive, a Christian gentleman." (This also accounts for the saying that "The SC Gaddys come from Ithamar and the NC Gaddys from Thomas"[T2])
I apologize for the length and informality of the above extracts and personal memories, but I sense that you may be into a very worthwhile area of study of the family: that your "Martha" may have been one of those numerous daughters whose names and connections have been lost to us. I once estimated that T2 was born c1720, to be "of age" to acquire land in 1747, and (maybe unfortunately) that date has "stuck." A 1745 Martha, then, suggests someone of the "Virginia Gaddys," children, perhaps, of William and Mary Gadd(e)y, prior to the migration from Bedford to NC in 1760. I'd suggest you watch both Va and NC lines for the Stricklands and migration patterns, for many of these "neighbors" tended to move about the same time and into the same areas. (Also note that I am stressing the "-ey" spelling, which persisted in T2's line until the early 1800s in Anson. In George Gaddey's will, the name is spelled three different ways.)