I have a few comments....
I am interested in the source for "William Carrell 20 Mar 1762, 17 Nov 1768 probate records" and what these dates represent. I have the 3 volumes of "Chronicles of the Scotch-Irish Settlement” by Lyman Chalkley (1912), but I've not identified an adult William Carroll in this timeframe other than the one on Smith's Creek, whose Frederick County VA will was probated in 1759. Part of Augusta County became Frederick County in 1753.
Rebecca Carrell, who married Robert Wear, was the granddaughter of James Carrell (1660-1720) and Sarah Dungan from Bucks County PA - her father was James Carrell II. Robert and Rebecca Wear eventually removed to Wear's Valley in Sevier County TN.
"William Carrell Died in 1758 in Frederick, only heir Joseph carroll lived in Kanawha Co." is incorrect. His will, which was probated 05 Jun 1759, names 2 sons and 3 daughters as heirs. One of the 2 sons was named Joseph, but I have not found documentary evidence that the Joseph Carroll in Kanawha County was the son of William Carroll of Smith's Creek. It appears that "Joseph Carroll, only surviving son and heir of William Carroll, deceased, late of Frederick County" from a 20 Nov 1771 Augusta County VA will has been misinterpreted. The older son, George. had died prior to this deed. As noted previously, Joseph was not the only heir based on the will.