I also am a decendant of The King Family in Sandy Mush Buncombe County N.C. Most of my Fathers side of the family still live in those mountains today. I remember going up to Sandy Mush from Charlotte as a little boy to the King Home Comming which takes place the first Sunday of September every year. This has been a King tradition since the early 1800's and some say even longer than that.
I do believe all of the Kings from that area are related. I've done some checking and found residents of Sandy Mush were some of the first to bear arms in the Civil War. There are some interesting sites on the history of Buncombe County that gives information on Sandy Mush.