Another angle not mentioned is the treaty in 1809 between France and Austria whereby Western Galicia went to Poland which was not in Russia's best interests.
From Wiki:
The 1809 Austrian war treaty had a clause removing Western Galicia from Austria and annexing it to the Grand Duchy of Warsaw. Russia viewed this as against its interests and as a potential launching point for an invasion of Russia. In 1811 Russian Staff developed a plan of offensive war, assuming a Russian assault on Warsaw and Danzig.
In an attempt to gain increased support from Polish nationalists and patriots, Napoleon in his own words termed this war the Second Polish War: "Soldiers, the second war of Poland is started; the first finished in Tilsit. In Tilsit, Russia swore eternal alliance in France and war in England. It violates its oaths today. Russia is pulled by its fate; its destinies must be achieved! Does it thus believe us degenerated? Thus let us go ahead; let us pass Neman River, carry the war on its territory. The second war of Poland will be glorious with the French Armies like the first one." Napoleon daily decree, June 22, 1812. The "first" Polish war being the War of the Fourth Coalition to liberate Poland from Russia, Prussia and Austria), because one of the official declared goals of this war was the resurrection of the Polish state on territories of the former Polish-Lithuanian Commonwealth. Tsar Alexander found Russia in an economic bind as his country had little in the way of manufacturing yet was rich in raw materials and relied heavily on trade with Napoleon's continental system for both money and manufactured goods. Russia's withdrawal from the system was a further incentive to Napoleon to force a decision.
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Really had Napoleon properly set up Poland as a kingdom there is no doubt that he would have distanced himself from certain German states. On the other hand the Poles would have ended up rallying to the cause even more and he would have had a staunch state-ally in the east that never would have wavered like the others did when thing went south. The Poles were Napoleon's most staunch allies during the wars.
Well, some of the Allied generals were his allies too!

They always seemed to do the things he hoped they would.
Except for old Vorwarts! HUZZAH! (enter Ludwig the Magnificent)
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