Further scenarios that could possibly have produced a German victory:
-Hitler doesn't halt his Panzers at Dunkirk and the BEF is captured. England is forced to accept peace; the Allies are out of the war. No second front, no lend-lease for Russia.
-Hitler doesn't impulsively switch from bombing airfields and other military targets vital to England's defense, to civilian targets in response to the RAF's night raid on Berlin. The already on-the-verge-of-destruction-RAF isn't allowed crucial time to recover and is instead eliminated. Operation Sealion commences and the English, who are so outgunned that they have individual artillery pieces defending several miles of ground, are no match for the combined Heer and Luftwaffe. England is forced to accept peace; the Allies are out of the war. No second front, no lend-lease for Russia.
-Operation Barbarossa is not delayed.
-Japan invades the USSR from the East.
-Germany doesn't delay total economic mobilisation until 1943, but instead does this early in the war, at least by 1941.
1. I doubt Engalnd had surrendered. They were an island. Untouchable by Hitler. And England could force lots of men into the military. Sure, they would be far less trained, but they had them.
2. Sealion was unfeasible even with the RAF destroyed. Germany hadnt the shipping to invade the UK in force with the brithish navy still untouched.
3 and 4. Explain how that would havelead to Stalins surrender.
5. That is the only thing that could have affected the outcome, imho. And only if Germany doesnt declare war on the USA in dec 1941.