Exactly Moscow was the Military heart of the Soviet Union, the whole command structure ran out through Moscow, all orders came from Moscow, if Moscow had been taken as it could have if the Panzer Groups 3 and 4 had not been diverted to Leningrad and Kiev respectively but maintained their armoured drives towards Moscow the Soviet Capital would have fallen sometime around August 1941 as at the time no re-enforcements had arrived from the Central and Far Eastern Commands.

Once Moscow was in German hands the whole command structure of the Soviet Army would have collapsed, Leningrad and Stalingrad would have followed and most probably the Caucasus oil fields as well.