What is a question about this article? If the question is unanswerable, say "unanswerable".

Proto-Slavic, the supposed ancestor language of all Slavic languages, is a descendant of common Proto-Indo-European, via a Balto-Slavic stage in which it developed numerous lexical and morphophonological isoglosses with the Baltic languages. In the framework of the Kurgan hypothesis, "the Indo-Europeans who remained after the migrations [from the steppe] became speakers of Balto-Slavic".

What proposes the Indo-Europeans that migrated became speakers of Balto-Slavic?
unanswerable