To solve your problems on the Benjamin Hambrights please see The Shoe Cobbler's Kin, a genealogy of the Peter Eaker, Sr. Family, Volumes I & II and German Speaking People West of The Catawba River in NC 1750-1800. It takes all three of these books to solve the delimea. Benajmin, son of the Col. died in Knox Co., TN, Benjamin, son of John died in McMinn Co. Tn area, Benjamin son of Frederick, Jr. did not die in KY. He has been traced through KY, IL, MO, TX, CA and died in NE. Most of the documentation is in Vol. II regarding his sojourn.
These books can be found in most major library collecions or you can request information about them at: firstname.lastname@example.org