How did Lenin's view of imperialism not be in conflict with Marxism?

As the history of the twentieth century has revealed, revisionism, being anything contrary to Marxism-Leninism, generally does not sit well with the main stream of of international socialism. This was made evident in the 1960-2 Sino-Soviet split. With that said, the Leninist theory of Imperialism asserts, just as Marx's view of capitalism asserted, that capitalism cannot function without leading to crises and revolutionary situations. Both theories rest their optimism on the demonstration that there are forces within capitalistic or imperialistic society that are not bound by vested interests or other fetters of consciousness enough to lead mankind toward a better future. The inevitable doom of imperialism and the existence of revolutionary forces are the center of Lenin's idea.