About Vlachs and their relationship to Romanans, has any extensive genetic study been made to try to give another clue, one from the point of view population genetics, and not just from of historical linguistics', about the still widely discusse issue of the territorial origin of Proto-Romanian speakers? I find the evidences pointing out to an origin in the Central Balkans, a bit west and south of present-day Romania, quite overwhelming, and of course the still extant Vlach, Arumanian-speaking population there, near the supposed homeland, could give us good indications of the real historic past of the Romanian people.
Since Vlachs are Latin speaking people of different acnestries all over the Balkans, I really don't know how you can find a genetic relationship between them and anyone else, because they would not have a clearly recognizable genetic profile.