Yeah it sounds like we basically agree on the macro level while acknowledging the murkiness of it all. Issue is the celts are first found right were the corded ware were and later germanics, but the old theory is the germanics swept down from the boat axe regions. The more I learn about it the more I see the various branches of the family as very similar to begin with. Like supposedly perun the slavic god was like one or two letters off a common epithet for thor. I think the Scythians have something to do with the picture too, for much of antiquity the steppe was largerly germanic. There are still places in the crimea with old gothic names for instance. It's kinda wierd because ppl claim the Scythians spoke indo-iranian, but when the huns took over that region a bunch of germanics flooded into and eventually crushed the empire. The luwians are very interesting also. Had a god name tiwaz and we're fierciely independent and much of europe claims to have come from this region around the time of the bronze age collapse.