You'll see that I used the word "possible." One of the key differences between anarchist and state communist thinkers is the dogma: the former, like Kropotkin, though willing to lay out a general outline of what they think must be done, aren't willing to dictate a One True Way to anarcho-topia, whereas your Lenins and Trotskys would argue that there must be a revolutionary party that must seize the existing institutions of state power and must institute a centrally administered dictatorship of the proletariat.
The more dogmatic, uniform nature of state communist thinkers is evident in their lexicography, anarcho-communists and other leftist dissenters are but "petit-bourgeois," to be purged the moment the Party has assumed power. Or maybe sooner. Trotsky, for example, calls anarchism "an utterly anti-revolutionary doctrine" due to its principled anti-statism, blaming it for the fascist victory in the Spanish Civil War:
To renounce the conquest of power is voluntarily to leave the power with those who wield it, the exploiters. The essence of every revolution consisted and consists in putting a new class in power, thus enabling it to realize its own program in life. It is impossible to wage war and to reject victory. It is impossible to lead the masses towards insurrection without preparing for the conquest of power.Trotsky, of course, wrote those words while living in exile, having been purged from the Communist Party leadership by Stalin, who later had him assassinated. Live by the conquest of power, die by the conquest of power.