Sncerely I have hard work to imagine Y-R1b-U106 did not play a central role in the Germanics formation.
Dear Moesan as I elsewhere stated there is archeological evidence that Unetice is related to German territory.
Maciamo made on the Eupedia site a very interesting remark about the
Unetice culture in relationship with the spread of R1b S21:
"The principal Proto-Germanic branch of the Indo-European family tree is R1b-S21 (a.k.a. U106). This haplogroup is found at high concentrations in the Netherlands and north-west Germany. It is likely that R1b-S21 lineages expanded in this region through a founder effect during the Unetice period, then penetrated into Scandinavia around 1700 BCE, thus creating a new culture, that of the Nordic Bronze Age (https://en.wikipedia.org/wiki/Nordic_Bronze_Age)."
http://www.wdgolden.com/genes/wp-co...A-Golden-YDNA-U106-distribution-in-Europe.png
The Unetice culture in Northwestern Germany and Northern Netherlands is called the
Sögel Kreis.
Prof Harry Fokkens (1998):
''The northern Netherlands is part of the northern group (NW Germany and Denmark) especially of the Sögeler Kreis characterized by a number of distinctive men's graves. The
Drouwen grave is the best known Dutch example.It's remarkable that the Elp culture has never been presented as the immigration of a new group of people. Because clearly this period was a time when a number of new elements made their entry while others disappeared. The disappearance of beakers, the appearance of the Sögel men's graves with the first 'swords', among other things, the fully extended burial posture, under barrows; all the factors have been reason enough in the past to conclude that the
Elp culture an immigration of Sögel warriors."
See also this link from 2012.
So DNA research and archeological findings may come together. The spread of the Bronze Age culture was obvious not a matter of acculteralization but of immigration and 'take over'.
And finally as Tomenable beautiful plotted my aDNA is typically Nordic Bronze Age.....