Deleted member 1487
Just speculating. If Stalingrad had been taken in September, how would the supply situation look for Soviet forces further south in the Caucasus.
There was a minor rail line via Astrakhan and as it was the fighting meant that the Volga was blocked as it was, so Stalingrad was irrelevant to supply the Caucasus IOTL during the fight. Most of the supply IIRC came via the Caspian and Baku, plus over a rail line from Iran carrying LL supplies. Apparently 40% of the AFVs used by the Soviets in the Caucasus were LL models via Iran.