Here's the way I understand the history of the 83 acre tract --
On April 1, 1770, Joseph Scott and his wife Janet sold 480 acres on both sides of Hogans Creek to Daniel, William, and and George Allen. The witnesses were Thomas Flack, John Allen, and Wm. Smyth. On November 13, 1770, Daniel, George, and William Allen sold 83 acres of the tract to John Allen for the consideration of 5 Shillings each. The sale wasn't recorded until November 13, 1779, perhaps because John was ill and wanted to have clear title to the land before he died -- he was "weak of body" and wrote his will less than three months after the sale was recorded.
On August 5, 1788, Daniel Allen Jr. and his mother, Sarah Allen, widow of John Allen, deceased, sold the 83 acre tract on Hogan's Creek to Joseph Clark for £100 gold and silver. This tract was said to join the land of Daniel Allen Sr., George Allen, and William Clark Jr. The witnesses were Isaac Clark, John Pritchett, and Michael Leathers.
It seems obvious to me that Daniel Allen Sr and George Allen of 1788 were John's brothers -- does anyone know what happened to William Allen? Did he sell his land to William Clark Jr?