They both decided to leave Alabama by 1859 and moved towards Mississippi ending up near Isney, Alabama, which is near the State Line in time to be counted on the 1860 census. By 1861 both men and their families are located in Jones County, Mississippi. Surnames associated with both families include the Herringtons, Hamiltons, Bush, Geigers, Ulmers, and Myricks. Most of these marriages occurred in Mississippi, but we suspect they may have known of each other before 1860. My wife's main line of ancestry, and searching the line can drive you up the wall.
Records abound, but tying a particular group together is a challenge.
My gut feeling is that most Overstreets of the Southeast United States including Texas are related in some form. We will probably all wind up in Virginia about 1700 when we find enough proof. It appears that kinship exist among the Carolina Overstreets and Georgia Group in 1800. The Savannah River area on both sides had many of them. Their migration took them into Florida, Alabama, and Mississippi before 1830.