William Walker m. Sarah Holcombe: This William Walker's father was George Walker whose will was recorded in Jessamine County, KY, 22 Dec 1798. The will mentions George's wife Priscilla and children including William Walker, several other sons, and one daughter Nancy. So this George Walker, William's father, does not fit the George m. Susan who died in 1787.
William Walker's second daughter was named Jane Curl Walker, so we believe there was a Jane Curl(e) in the family tree a couple of generations back, but it does not appear to be the Jane Curle you mention.
There were actually quite a few Jane Curles in the 1700s. Ours as yet has not emerged that I have been able to find.