: I saw that theory (vigesimal) that was in Wiki but you should understand 1. it's not widely accepted and many have criticised it. 2nd Many populations which had not to do with Celts used it. 3rd Basque language is not i.e. language and the relations between them and celts are to be clarified (why germans don't used it? but it remained on france in old Gallic region?) 4th It could have been coexisted in Basque population and Celts populations indipendently, as it could have existed in other populations of that time. 4th vigesimal system is older than decimal system (it contains the fingers of the hands and foots )which means that the old populations have used it BEFORE decimal system and this is related to the facts that I have mentioned about formation of Illyrians. As for the "brutal interruption"  this has happened in history. May be the term I used was "brutal:)" but the idea is that there is not a change in that culture to show the change in population of that territory and this leaded to their conclusions. 
 As for Panonia what??? Do you know the territory of Panonia [] and their population? Slavs before Celts??? Are you sure??