and all ancient remains will never be tested. but that is a "god of the gaps" type argument tho.
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Because it could still be native Balkanic (maybe northwestern) that rapidly expanded at some point in time. Slavic expansion the way most people imagine it is another bullshit theory that relies on barely any evidence. We know for sure they migrated to Greece/Eastern Roman Empire but we don't know the exact origin of the people that did this. They could very well be similar to modern South Slavs. Even Illyrians, Thracians, Dardanians etc. could have spoken an earlier version of Slavic for all we know.
I think Florin Curta's theories of ethnogenesis of slavs (they only became "slavs" once they crossed the Danube) are interesting, but kind of outdated. I2a1b dinaric is a little bit odd (but getting increasingly certain its spread is linked to dark age migrations in east europe) but there is still r1a1 that pretty well establishes a fairly localized origin of east-central europe for incubator of proto-slavs. whether they added other paleobalkanic, germanic, and pannonian folks to their numbers (as is common in warrior tribal societies) obvious.
Only CTS10228 is "Slavic" - I2a1 is definitely not SLavic neither is I2a-Din