In George Orwell's animal farm, how does Orwell use events in the book to explore ideas about the revolution?

Animal Farm is a dystopian allegory based on events that occurred during the Russian revolution of 1917. In this sense, all the events that occur within the novel, such as the farm animals rebelling against their farm owner Mr Jones, can be seen as an extended metaphor of the events of 1917. This element of revolution represents the citizens rising against the political leaders during the Russian Revolution. Orwell assigns the central characters traits which represent key actors within the Soviet Communism party. For example, Napoleon, one of the pigs, represents Joseph Stalin as he becomes the leader of the farm, despite challenges from fellow pig Snowball, who is based on Leon Trotsky.
In Orwell's novel, Napoleon can be seen to take a totalitarianism approach to his leadership, where he dictates to the other animals exactly what is expected of them and expects complete subservience in return. This is the approach that Stalin took during the revolution, and therefore by assigning Napoleon this role, it could be suggested that this is an attempt by Orwell to critique Stalin's approach, as well as the Russian Revolution in general. However, as with Trotsky during the revolution, Snowball can be seen to challenge this totalitarianism approach. Most importantly, despite a short lived period of utopia, Orwell ends the novel in a very similar way to it begun, with the animals suffering at the hands of its leaders. Despite the desire for change, the approach taken by Napoleon led to a similar level of suffering of the other animals that was felt under the leadership of Mr Jones. This is itself is a clear critique from Orwell of the Russian Revolution as it is clear that the change in leadership has done very little to improve the lifestyle of the citizens, but has only benefited its leaders.