It is very possible that the Indian identified by Colonel Christian as "Logan" was the notorious Iroquois-born leader of the Mingo tribe of Ohio known by whites by that name. After Lord Dunsmore's War of 1774 the Mingoes were broken up and scattered, and although East Tennessee seems far from Ohio, Logan raided up and down the frontier and indeed was reported responsible for raids with Cherokees, Shawnees, and Delawares along the Holston, Powell, and Clinch Rivers as early as 1774 (Christian to Preston, November 8, 1774). Logan was killed by a nephew in 1780.
For more on Logan, see http://www.shelbycountyhistory.org/schs/indians/chiefjameslogan.htm.