Richard Rocca received the SNPs of about 100 Sardinians of the Francalacci (who is the sender) et al. 2013 test, that of the PF SNPs and augmented with them his interesting tree.
Richard Rocca has always thought that R-U152 isn't Italian, better Swiss or French, and, as he is finding the closest link to his Full Y in people of the Sardinian pool, it is necessary to demonstrate that those Sardinians came from France. This was the thesis also of Francalacci & Company when thought that the Italian mtDNA U5b3, born probably in Italy, was in some way come from France. This is the odd link between them.
For some samples it is easy to say that these Sardinians came from the Tyrrhenian coast who at their time came from South France, but there are two samples of a new subclade of L20 with 48 SNPs. Even if we take 150 years for SNP like Michal did for his R1a, they are 150 X 48 = 7200 (YBP).
May Richard Rocca say that these Sardinians came from South France 4500 years ago with the Bell Beakers?