I may not have a chance to dive into the Basque issues until after tax season. Did Barry Fell analyze the ancient Basque writing as he did others from that time and region? I don’t remember if he and Gloria Farley ever looked at that.
I do know that Portuguese sailors were fishing the Grand Banks of Newfoundland very early on. Could Basques also have done so? There is also the report that Mandan Indians apparently knew some Welsh words. Were there also Welsh fishermen in those early centuries. At any rate I wonder if it may be just as likely that Basques and Welsh met up with American Indians on shores not too far from the Grand Banks and left their language traces. I now consider it less likely that American Indians traveled to Europe and left language traces. Perhaps after reading some of the links you have left here and at the other links listed I may have a revised opinion.
The article you posted about which Indians hated which Indians the most not long ago, certainly tells an interesting story about how they progressively pushed or were pushed from East to West over the centuries. Where did the Shoshone and Mandens originate or live 2000 years ago?
There was a Basque chauvanist in the ESOP group who pushed a pro-Basque agenda and denigrated much of the other (real) work on ESOP.