Very interesting, that the name Bunch is Melungeon.
Weren’t (aren’t) the Melungeons a mixture of native american, white, and black? If so my guess is that the descendants of the white woman and Bunch/Punch joined the Melungeon group, but of course Ancestry.com has no real connection.
I think that this news item was put out there just to promote Obama’s next $100,000 a plate fund raising dinner. The theme will be the “Take a Punch to Lunch Bunch”.
The mix you describe is called the tri racial isolate and referred to Melungeons.
Current belief is that the mix is far, far more complex. I’m probably a little behind on the current thoughts resulting from intense investigation and DNA studies.