So, basically, assume that the Western Allies don't withdraw from the purple zone in the map following the end of WW2 (perhaps through increased fortunes in the later fight against the Germans). The Soviet occupation zone is considerably smaller. Therefore, Stalin, doubting the economic viability of an East German socialist puppet state, decides to go whole hog on his expulsion of the Germans from Eastern Europe and extends the deportation effort to Brandenburg and Saxony. Poland ends up annexing Brandenburg and perhaps all of Berlin, while Czechoslovakia annexes Lusatia and Saxony, greatly improving its mining industry through control of all the Ore Mountains. No DDR equivalent is estabilished, albeit the USSR still props up pro-communist groups in Germany proper, with varying success.
I ask, is this scenario at all plausible?
How would Poland and Czechoslovakia enact their cultural assimilation policies in regards to remaining Germans in their territories?
How does this affect the political landscape of Germany, Poland, and Czechoslovakia?