It seems the system which gives the older dates would be more reliable. ATW whatever the choosen method, beginning of Celtic individualisation is older than affirmed by some people. It confirms rather my thought that it and Italic evolved around the BB phenomenon period, surely in Western places, and the language at least - not all the later cultural artefacts linked to the culture - has not been introduced by post Seyma-Turbino steppic tribes. No absolute proof, it's true, because we know that the places were a language stays are not by force the place where it did its genesis. But if we put anDNA modif's, archeoL and linguistics together...