And if he captures the coalition monarchs?
Then maby Napoleon can get the peace treaty he needs but I'm not vary convinced that he could do it considering that that never happened at any point during the Napoleonic wars (and a long time before that) but if he was able to then I see
Alexamder: making a peace to save his own live, then repudeat it at the next available point.
Willam: would love a peace treaty to save his kingdom only to have his own army make his wife or son regont and continue the war.
Franz: would also make peace and leave the war
So that would give Napoleon valuable birthing space but the problem is that his mistakes earlier (the Spanish ulser) mines that he dose not have the man power to win the war with britain and his enemy are gust going to try agene within 3 years time and continue to grind his army down.
At this point the only option for Napoleon to coutue his empire is for Napoleon to volvoluntary give up germany, Italy, Netherlands and probably Belgium and to give up his throne to his Austrian son inoreder for any kind of lasting peace to be created after the Russian invation, and that not only would this be so asb for Napoleon to do but I'm not entirely convinced it would even help keep the napolions on the throne of France.
So in short I still think napolions would still need two more Australiz's in order to make a stable peace after a very implosable victory a Leipzig.