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That is very interesting; off the top of my head, the implication seems to be that the picts, like the basques, are the remnant of a widespread migration across western europe before recorded history. It isn't impossible that they were actually one of the first wide migrations since the ice melted; i.e. stone age.

I didn't know that about colomba needing an interpreter; I am not sure if he would have needed one for a p-celtic language, or if he even spoke/understood p-celtic enough to do his work. The lack of almost any pictish language remnants is a real mystery. How it disappeared quietly with no visible trace baffles me.

Do you know of any other ethnic groups with high %-correlation to basque dna?

The Irish are, like the Scots, and the Welsh, and the Bretons, strongly genetically matched with the Basques. But then, so are people of all the regions first populated by the 'proto-basques' who descended from the Pyrenees aftger the last Ice Age: Northern Spanish, and Portuguese; Western and north western French, and, Icelanders, seeing as how they are largely a blend of Western Norewgians (likely more Basque themselves than the rest of Scandinavia) and British Islanders.
As for the original divide, it seems likely that groups that over-wintered in the Balkans, and later moved into Germany also moved in to England, and so were related to who were to become Anglo-Saxons, long before we knew who the Angles et al were; meaning that the proto-basques likely lived next to small groups of non-proto-basques, the latter were 'stranded' on the Island, and were subsequently 'celticised' during the first invasions from teh Contintent, and then, subsequently, 'Teutonicized' BY THEIR OWN GENETIC KIN once again -- the Anglo-Saxons. That is why so many Britons were so easily absorbed in to the Anglo-Saxon society and why you can very seldom tell them apart...not because anglo-saxons conqured Britons, but because the Britons, to a considerable degree, were ALREADY very much like the Anglo-Saxons, and their continentalist kin, the Celts.