Who might rule the Soviet Union after a 1941 fall of Moscow

If Germany captured Moscow in 1941, who might replace Stalin and would the Soviet Union leave the war?

There was no obvious successor; a troika involving figures such as Beria might emerge, while collapse or withdrawal remained possible.

The counterfactual asks what follows if Germany captures Moscow in 1941. Stalin had already eliminated much potential opposition, leaving no obvious replacement ready to command the state. Zhukov had not yet reached the later stature often projected back onto him, while Beria and other powerful figures might take part in a ruling troika. Soviet collapse or withdrawal from the war was possible rather than inevitable, and the English-language evidence for the succession question is weak.