apparently the main logistics guys actually calculated how barbarossa would go but then their chief buried the report because everyone around him kept going on about the triumph of will and shit

and then the invasion went exactly as the logistics guys predicted it would.

also, gotta love the overall nazi logic of knowing that if they dont win by christmas, they have no path to victory and will lose, and deciding "we'll just win by christmas then! contingency? what's that? we have aryan will!"