I do not have a copy of Otis' book, but there is one in the Family History Center in Goldsboro NC. Be aware that there are many flaws in that book.
Jonathan Isaac Gore was born 14 Dec 1795 Little River, Horry Co. SC and died 21 Dec 1864. He was married to Mary Elizabeth Hemingway, Elizabeth Bessent and Sarah Pearce.
Sara Pearce was the mother of William Cortenas Gore b. 26 Dec 1844 - d. 24 Apr 1883.
William Cortenas Gore md Sarah Mary 'Mollie' Vereen and his daughter Mary Sarah Gore md. John William Humphrey which I presume might be your line. This last couple had 7 children for who I have I no further information.
Johnathan Isaac Gore was the Son of William H. Gore Sr 27 Mar 1753 - 30 Oct 1828 married to Mary Ann Simmons b. 8 Oct 1757.
As of this date it is not known who the father was of William H. Gore. Much research by many has been done on this William but so far no proof that his father was a Joshua.
Feel free to ask any questions!