It is a certainty that, by 1943 if not earlier, Hitler was far more debilitating to German war efforts and there is no doubt that Germany's performance could have been more effective absent his "leadership." So, I suppose Citadel (or something at about the same time frame) succeeding might have engendered enough casualty through encirclement that Stalin asked for a cease-fire (might have been labeled peace but would have only been a cease fire for rebuilding in practice). I really doubt it though. The numbers simply do not line up.
It is possible that I am overestimating Soviet abilities and will for the 1942 season. I don't think that campaign ever carried the potential for a kill blow as did the one in 1941, but I can understand how you make that argument. With Hitler NOT involved beyond the grand strategic level and with Speer active before 1943, it is certain that Germany would have been more dangerous.
I believe that you are both correct and wrong as to the manpower situation though. Postwar analysis reveals that approximately 1 in every 7 Soviets died during the conflict. Russia's population and growth numbers have literally never recovered from that calamity. By any rational measure, you are therefore correct that the Sovs were far closer to the "bottom of the barrel" on manpower than they seemed to be at the time. On the other hand, Stalin was at the helm. He truly had a Total War Game Series AI view of his own casualties and, I believe, had it required 1 in every 4 Russians/Soviets, that Stalin would still have prosecuted the war in much the same fashion. In other words, he would not have reacted rationally to the casualties level as we of the West would define rational.
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