Your paper records may say one thing but the DNA says another. D-59 matches Lineage 1 while D31 "could" match Lineage 2 but has not upgraded to discover if the L2 men are his genetic cousins. I cannot declare a Lineage match until there's a genetic match at 25 markers.
This might be a case of person trying to make the paper trail fit into the House of Dunbar pedigree. There was no proof provided that Thomas Henry Dunbar was the son of Maj. John Dunbar & Catherine Wynn....only an assumption. Tom Dunbar, Clan Dunbar's genealogist, worked for months trying to find the connection between the Rasharkin Dunbar's and the Ballycarney (sp) Dunbar's. Or, this could be a case of genetic discontinuity, meaning somewhere along the line a new male "parent" was introduced into the Rasharkin Dunbar lineage.
I don't know if you've seen the House of Dunbar Pedigree chart which is available through Clan Dunbar, but about half way down, there's a large notation titled "All Dunbars Descend from Here". I believe the person who developed the chart was thinking in terms of the Titled Dunbar's. Too many people have taken this chart literally to mean that we all had to fit into one of these Titled families. I'm not convinced this is true. We know quite a bit about some of the male Dunbar's above that notation but there's so much more we don't know about all the other male Dunbar's above that notation. Those that didn't inherit had to strike out on their own and their lineages have been lost through the centuries.
Dunbar DNA Project Administrator
I could be completely wrong, but I have been checking Pedigrees (update 29 Dec 2008) against my paper records and believe that -
D-59 Sir John Dunbar, b.~1570, Avoch and D-31 Thomas Henry Dunbar b. 1784 Rasharkin are 4th. gt. grandfather/4th. gt. gson.
This is a very interesting line, and I have Scottish, Irish, Cornish and present-day Australian connections for the family.
It would be interesting to learn the relationship between the authors of these Pedigrees.
Organiser, Dunbar Family Society (UK)