Quote Originally Posted by markod View Post
That explanation doesn't work, since proponents of the hypothesis think the substrate is exclusive to Germanic.
But to be fair, it's probably not.

It's well known that Indo-Europeans languages are full of Epithets, sometimes used as proper Noun, other times as Nickname. The thing is, there is " IE words " in non-Steppe territory probably even before Steppe was a thing. Pretty sure all words considered as a substrate might have an equivalent in Balto-Slavic or Italo-Celtic one. And if not, well obviously the original Balto-Slavic land was never Driven by Admixture so the substrate could come from all West of the Vistula CWC territory and only affected the Germanic part of Germano-Balto-Slavic continuum.