Geneology - What's yours?

[gilmore]

...The gaps I was referring to, however, are ancestral and I don't think can yet be filled this way, can they? That is, if I am A and know for certain about ancestors B through L from a paper trail, will DNA testing produce M?

I am not sure what your question is.

If one man has a paper trail to an ancient ancestor, and another has a dead end more recent than that, and the Y DNA results show that they match, then of course it would be reasonable to conclude that they are descended from a common ancestor.

There are other true gaps--not mere dead ends--- that genetic genealogists claim to have crossed with no paper trail at all. The haplotypes of descendants of Niall of the Seven Hostages and Somerled are said to have been identified.

Also, Genghis Khan's male descendants are said to be identifiable. There are quite a few men of Asian ancestry whose Y DNA shows a common ancestor who lived at the right time and place. Given the early Mongol policy of killing men and taking women as slaves of the areas that resisted them during the period of Mongol conquests, it dovetails with documented history.

Among Jewish men there is the Cohan Modal Haplotype that often but not always occurs in men whose families are said to be kohanim, in other words descendants of Moses' brother Aaron, if I remember the Old Testament correctly.