A few thoughts: The western KY Herrins are related to my Pulaski Co., KY Herrins... not for certain, but likely. I have tons of supporting evidence. My Shadrack Herrin (b. 1765-1770) lived in Jackson Co., Al until at least 1830 coming from Pulaski Co., KY. He left many descendents there.
The Herrins and Ruckers intermarried in Albemarle Co., VA. Elizabeth Rucker married Thomas Herrin and lived in MAdison, later Gerrard Co., KY. Evidence points toward our Herrins coming from the Wake CO., NC area and possibly Albemarle Co., VA before that.