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It seems pretty certain that this JOHN CALCOTE, perhaps still a minor, would have moved from Dobbs Co NC to Craven Co SC in about 1774 and that his marriage was in SC in the late 1770s or early 1780s. As I know from my research into his brother JAMES, finding SC marriages of that period is somewhat problematical.
As Frances Calcote Brite's research for her "Calcote Family Journey" (Gateway Press, Baltimore MD 1997) was centred on the Revolutionary War service of this John Calcote, and her descendency from him, I think it likely that she has been pretty exhaustive in looking for John's wife. As she says, the CADE attribution is only circumstantial.
By the way, this book, which is not only full of well-presented information but also beautifully produced, can be ordered (assuming she still has stocks) direct from Frances at PO Box 544, Pleasanton TX 78064-0544 (no e-mail).