Bingo! I congratulate a true student of history.
He left out the hindrance of Hitler. Had Hitler NOT stopped the initial drive toward Moscow and sent forces south, then resumed the attack on Moscow after the winter started freezing men and machines, the world would look totally different today. Hitler was somewhat a student of history and understanding that Napoleon took Moscow but was still defeated, Hitler saw it more important to take the oil fields to the south. What Hitler didn't understand was that, Moscow of 1941 was a railroad and communications hub for the Sowjets. Cutting this central hub would have decapitated the Russian war effort. It would have been impossible for Sowjet commanders to coordinate attacks/defenses against the greatest military machine since Alexander the Great. Germany would have, at will, picked off one Sowjet army after another. Some of Hitlers generals understood but Hitler wouldn't be moved. Had Hitler taken Moscow when it was easy, before the worst of winter set in, he had the whole country of Russia in the palm of his hand but the FOOL, looking back at Napoleonic times, had no understanding of the 1941 situation.
In addition, Hitler also halted the drive towards Dunkirk. Had he not done so, there would have been no evacuation of Tommy ground troops, Britain would have virtually no ground forces to repel the Wehrmacht, England invaded /conquered, no two front war for Deutschland, the entire German army would have been available for operation Barbarossa, and quite possibly England/Russia would be speaking German today.
I had read, somewhere, that Hitler did not see the Brits as mortal enemies in the beginning of the war. He had hoped that stopping at Dunkirk, England would either join him or at least fall out of the war. Just something I had read.
There were many other reasons, starting with the decision to attack Russia in the first place. I say Providence. There were a thousand reasons why the war turned out the way it did, none were an accident.