Check the book The Overmountain Men by Pat Alderman. It can be purchased from the Overmountain Press. They are very reasonable. There are several lists there. My Walker ancestors were freinds witht he LeNoirs. A John Walker and a Lenoir were witnesses to my great-great grandfather's wedding. They fought together in King's Mountain.
I amn reserching the nature of thier friendship but havae found nothing so far.