So, obviously a defining ideological difference between anarchism and Marxism/Leninism is the issue of the state. (...)
First of all, there is great difference between Marxism and Leninism. Leninism effected with a state capitalism and Marxism is for socialism. Besides a term Marxism/Leninism was invented by Stalinism to empower a Leninism that is intellectually poor.
In terms of maintenance of communist society, I think it is irrelevant issue. Working class don't have to be aware of Marx's theory to start a revolution. Marxism isn't needed to fall a capitalism. It will fall anyway. Will there be many communist or not, capitalism will fall and now it seems to be a case irrelevant of communist efforts because I think the greatest enemy of capitalism is capitalism itself.
"Property is theft."
Pierre-Joseph Proudhon
"the system of wage labor is a system of slavery"
Karl Heinrich Marx