So what you're saying is that there was never any reason to migrate west, therefore no western migration took place by anyone?
So what you're saying is that if Brezhev couldn't completely and fully feed 350 million people or so from the Ukrainian soil in the 1970s, that means that the farm-loving Assyrians sneaking out the back door of history would have turned west above the Black Sea to escape the Ukrainian desert. They of course coveted the lush plains of Germany, which Caesar unaccountably describes as dense, dark forest peopled by tribes who never cared a thing for the plow.