He fulfilled his duty to democracy thoroughly by that. He treated Marxism as a guide to action, not a dogma. Contra the liberal image of Lenin as a rigid dogmatism, the opposite was true. This fact is basically all included in Marx's understanding of the state, and his clear belief that the proletariat would have a state. A state is not run by concensus of the totality, rather , at best, dictatorship of the majority.
Democracy is state dictatorship of the majority.
There is no clear answer to any of these. The Duma instituting socalled democratic and civil liberties would not have been preferred by Marx over an effort to establish a proletarian republic, socialist republic, with state repression of bourgeoisie. That idea originates with Marx. Thanks for acknowledging this aspect. Life was not so bad socio-economically.