It is untrue that Welsh has any similarity to Basque - the languages could hardly be more different.
One theory of the Basques is that they were Etrurian fugitives from Roman oppression. That may just be a theory of conveneince since no writings in Etrurian have ever been found Rome vigorously suppressed Etrurian culture. Later Spain became mostly a Roman Province and the Basques may have fled again to the North of the country and spread into present-day France.
there are a great many similarities between Breton and Welsh including folk music and folklore.
Language gave quite a lot of words to French - such as buerre - Welsh barra - butter; ecole - Welsh ysgol - school; eglise - Welsh eglwys - church but many, many more. No even close similarity to these words exists in Basque as I understand it. Mind you I am not a Basque linguist.
Professors have some obligation to produce new work and bring funds into their universities. For a sufficient sum a Professor can be found to say that coffee is bad for with lots of proof, and another to say it is proven to be very good for you.
DNA theories are the latest science fiction - believe little about racial origins that you hear - they are mostly based on poor statistical method and fuelled by public willingness to be gulled. Only a couple of years ago they "proved" that everyone is descended from an "Eve" who lived in Tanganyika many years ago. Then that most of us descend from the Tartars, now from Iberian Celts, Basques etc etc.
