I would agree with you that "if it sounds too good to be true, it
usually isn't," but, just because a pedigree has Southern origins, that
does not mean it is probably reliable.
The web is loaded with pedigrees for one of the Southern surnames I
research, that contain a whole string of invalid ancestors. These
ancestors were unproven with conventional research and recent genetic
testing has shown no biological or genetic connection. Yet, when I
posted the results of the Y-dna tests on the false pedigrees, not one
person questioned my post-it on their pedigree.
My advice NEVER accept a pedigree from someone else until you have
verified it yourself.
Marleen Van Horne