i am confused, I thought the Getae where the germanic speaking goths after they mingled with the bastanae and the Dacians where thracians speaking celts next to the danube. Inward of these where the scordisci who according to strabo, where illyrian/celtic/thracian people
and inside of them the norici tribe a illyrian/celtic people
and inside of them next to the alps where illyrian/celtic/venetic Iapydes tribe and
illyrian/venetic tribe the luburni
thats what i read and was taught - these tribes mostly follow the danube inland
Strabo names clearly the Visi as getae, in area south Romania north Bulgaria, (VisiGoths)
By Herodotus the Getae where more North Central Romania and North and Ucraine,
from herodotus to Strabo we have some changes,
The Celts are considered as you said mainly west of dinaric Alps, and Pannoni Basin (except Galatians)
there was an interesting post of how yes no and dagne about Celtic and Slavic,
except lower Thracian like Bryges, some other tribes got or turned to Hellenic Sounds,
the rest thracian should balance among satem and Centum, (Thracian Getae)
the existance of Gothic in Balkans means as I said many,
1 Thracian were both Slavic -Germanic in a process of split (linguistic)
2 Goths in Balkans were the last of a big devastation of Germanic from east to west or from south to North
and left the known time in History,
other cases could be Getae being a Balto-Germanic that came south to para-slavic Thracian,
Celts moved west much before germans,
Germans moved west and North or South after the Celts
Slavic enter balkans after Germans devastation,
The case of Scordisci Serdi is clear that Celts lived as remants east of Dinaric Alps and many of them where assimilated, The case of galatians is clear for survivor of tribe,
for devastation like scordisci and some others seems like to be either military alliances either return to known lands that were left to get reborn,
we know that more primitive tribes moved from areas to areas every few years so that areas to get reborn,
I mean rich hunt, trees clean enviroment etc
to complete,
I believe at least in Linguistics that the ones we call today Germanic languages are not a product of west europe, but from Central-East europe,
I make all the posts just to show that it is impossible to consider that Germanic proto speakers were from netherlands or Norway or even modern Germany,
Germanic was proto spoken around Black sea - Baltic and moved West to complete as sounds and vocabulary.
That is my point and where i conclude,
from written in Greek we have view that authors had knowledge of Celtic and Thracian as already seperated. but living near or even among each other.
to make more simplify, if I can use the words Illyro-celts, they were west oF dinaric alps and in pannoni Basin sharing it or fighting for it with Thracians, probably and in some areas east of Dinaric alps,
south Thracians and getae, well personally I do not have a clear view of what south Thracian was, but north Thracian Getae turn more to Gothic or a ancestor of Gothic,