It doesnt matter, see how Napoleon messed up under Lepzing, it wasnt because the allies were so good, it was because he didnt have experienced troops, veteran armies were worth their weight in gold, thats why Prussia after all of its massacres became so weak, thats why he lost.
After Borodino Murat begged him to allow him to pursue Russians, if he did Russia would lose then and there, raising another army in a country like Russia with the enemy holding most major cities would take another year or two.
lol... I'm sorry to say this Sokrates, but you're leaving in a dream world man. Almost a hundred million people, and you think that Poland would be able to administer all the territory? Right... please stop, and rethink what you just said. You give Poles a bad name.
Is my english not good enough? Napoleon never wanted to conquer all of Russia, i'd say that he could secure his position by restoring Poland to its former borders since Prussia was down to militias, Austria was limited in numbers and Russia was not able to raise armies fast enough.
Poland already had 120.000+ fighting men in both the Grand Army and its own Army, in the old borders it could easily raise twice that number and given how experienced much of the male population was from the constitution war, Kościuszkos uprising and Napoleonic wars Poland would instantly have an elite army of upwards of 150.0000 when everyone else lost theirs.