Yep, thought he was the smartest 'general' in the room, and maybe just a figure of destiny.
Well, he looked pretty damn smart after he told the German General Staff to ditch their rehash of the Schlieffen plan and instead go with Manstein's bolder stroke. That gave him an undue appreciation for his own strategic insights.
It never ceases to amaze me what kind of world we might be living in if Hitler had been either just a Little more cautious at certain key points, or conversely, even more conniving, but in the proper direction. #1) There's 100% no doubt he could have consolidated his holdings in continental Europe, if he'd chosen to stick with that and keeping cranking out his war machine. No one could touch him, as far as making a serious dent in freeing Europe back.
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Stalin wasn't interested in freeing Europe, but the disposition of the Red Army in '41 suggest he wasn't done taking, he just wanted to see the West bleed itself first.
#2) If he'd just left Britain alone and pushed west, timed it better / and put his resources into seizing key soviet oil reserves in the Caucasas-- as a key general pleaded (instead of shifting them to Moscow), he could have taken down the Soviet Union.
He was already at war with Britain because he invaded Poland. Britain wasn't quitting, and FDR was doing what he could to drag the U.S. into the conflict. He turned on Russia in hopes of taking out Britain's last hope, but the Germans vastly underestimated Russia's strength.
It was Hitler who turned his armies away from Moscow and instead compelled 2nd Panzer Army to divert south and help Army Group South complete the capture of Kiev. By the time 2nd Panzer Army could turn back toward Moscow the rains came and movement ground to a halt. When the frosts came and the offensive could be resumed the Germans annihilated the defenses in front of them, but ran out of time before the worst winter in memory closed in stopped an army unprepared for the environment.
The effort to take the Caucasus region stretched the Wehrmacht too thin, and permitted the Red Army counter stroke that captured the 6th Army at Stalingrad. It was unreliable German allied troops from Hungary, Romania and Italy that folded under Soviet assault and left the left flank of 6th Army completely exposed.
#3) Now this is more in doubt, but I think there's even I chance that if he'd stuck to hitting Brittain's factories, he could have forced their surrender in early Fall 1940 and had enough left in reserve to STILL take out Stalin.
The Luftwaffe came close to 'winning' the battle of Britain by focusing on airfields and air sweeps. The concepts of strategic bombing exercised by the RAF and USAAF were not part of Luftwaffe doctrine. They 'lost' when they diverted assets to revenge bombing against population centers (in response to British raids of the same type).
With the U.S. already trading war material to Britain in exchange for the privilege of garrisoning British islands they could scarcely spare the troops to man themselves the Luftwaffe wasn't going to drive the British out of the war by trying to bomb factories. They ended the Battle of Britain to cut their losses.
If Germany had the opportunity to fight Russia without having to try and occupy Europe from Norway to Greece, maybe they have a small shot, but it would require just about everything going right. The productive capacity of Russia was vastly underestimated and when Case Blue failed the writing was on the wall, even if it took three more years to get to Berlin.