Snowball organizes committees, designs the windmill, and fights at the Battle of the Cowshed before being chased out by Napoleon's nine dogs, mirroring Trotsky's 1929 expulsion. Afterwards his record is rewritten: the battle hero becomes the battle saboteur, and eventually an agent of Jones from the start.
The general lesson: once a regime has an expelled rival, all explanation costs drop to zero. Crop failure? Snowball. Broken eggs? Snowball. The absent enemy is the perfect enemy because he never contradicts the accusation.
The heretical question the fable leaves open: would Snowball have been different? He takes milk too; he sits at the committee table. The book refuses to show us the other timeline, which is itself the answer: systems select for Napoleons regardless of who draws the plans.
Why does every regime need an enemy more than it needs a friend?