Andrew Campbell is currently set as the father of two different profiles for Duncan Campbell and Mary McCoy. If this was a simple duplication I'd just propose a merge and be done with it, except both Duncan/Marys are set as the parents of two different Robert Campbells, and these are verifiably two different people. One Robert, of Voluntown CT, started a branch I belong to, and the other Robert died in Augusta, Virginia. Both have been the subject of genealogical books which both claim Duncan and Mary as their parents, and both have children born in Coleraine, Londonderry.
Hugh Campbell, son of the Virginia Robert (Campbell-8679) has a note indicating that his father Robert was son of a John Campbell and nephew of the Robert, son of Duncan, but I can't find any paper trail establishing any such John, and in order to fit an extra generation into the timeline, some of these dates are going to have to be amended.
I'm going to keep poking this puzzle as I get the chance, but I wanted to write something publicly so I can get other input (and so I can post this notice on the half dozen relevant profiles). It's certainly possible either or both family history will wither under modern scrutiny.
For whatever it's currently worth, my Grandfather, for whom I have a fairly well reconstructed DNA kit, seems to have leaned strongly towards his Campbell side. I have a number of segments which don't quite meet "Confirmed by DNA" status, but don't leave much doubt we all relate to the Voluntown Campbells. Several of these matches also very tenuously match with descendants of Hugh Campbell, which leads me toward the suspicion that the Coleraine Campbells were in fact reasonably close relatives, rather than just a confused coincidence.