That area was part of the Islamic Caliphate during the time period we are talking about so its conceivable black Islamic sailers/servants were taken prisoner by the Spanish and transported to South Carolina (then Carolana).
Finding "white markers" in what today is essentially a "white community" would not be a surprise of course. Finding "black markers" wouldn't be a surprise either, but finding Karachi' blacks' markers IS.
It is truly an interesting but very confusing tale. There has been a recent surge of interest by boomers to get to the bottom of their heritage. My area is home to an annual gathering where stories are swapped and genealogies scrutinized as never, never before.
I tend to believe that some Portuguese sailors with the Turkish genes sailed from Cartehegna and were abandoned by their Spanish Masters at a failed Georgia or Carolina Spanish colony.They somehow were amalgamated with other marooned or failed groups. I see no reason that some of the folks from the Lost colony were not part of the group.