When you read articles like this one, they try to give you the impression that if Stalin was to have left Moscow in October 41 the Soviet regime might have collapsed.
http://ww2history.com/key_moments/Eastern/Panic_in_Moscow/
Lets say one of the folowing PODs gives the Germans a little more strength going into Typhoon, enough that the Germans are able to do a little better, the Soviet panic is a little bit worse and Stalin leaves Moscow. Could this be a tipping point that would allow the Germans to win Barbarossa in 1941?????? (or is this all just made up drama to make the story sound better now).
a) Rommel takes Tobruk October 1941, troops on Crete evacuated early to reinforce Egypt - no German Crete losses - many more Ju52s available to help forward supply.
b) any one of the many better Luftwaffe scenerios, i.e. General Wever lives, a few hundred more Luftwaffe planes in the air.
c) The rain and weather come a week or two later in October
d) No Norweigan campaign happens - many Ju52 lost there OTL now available for forward supply, plus some extra divisions
e) Germans stop attacking Leniongrad a day or two earlier (there was a timeline on this). Meaning an extra panzer divisioned ruined is available.
f) etc...