Care to elaborate? In what ways do you think that Malcolm became greater after he left the nation? Just curious.
Are you serious? The nation stifled and held Malcolm's greatness back...in the NOI, he was forced literally to preach that black capitalism and black supremacy crap on a national scale where on a local scale he was spreading his Marxist and black agency/community ideas which upset Elijah Muhammad...once he broke from the nation, Malcolm was able to expose both racism and capitalism as an interlocking system of oppression that needed to be broken for black freedom struggles to be successful...he dropped the black supremacy garbage and preached that once the black masses freed themselves from racial capitalist oppression, other groups of workers (white, brown, red, etc.) can join together and overthrow the corrupt capitalist system;
More specifically, Malcolm took Du Bois' ideas and made them a powerful movement: race and capital were the two biggest components to the continued oppression of blacks in America and only through black agency can we overcome it; the NOI were capitalists and preached black economic power (even though its complete bullshyt if you know the NOI's history going back to Fard in Detroit); even through all of that, the betrayal by the NOI, and the threats on his life and beefs with others, Malcolm was still willing to work with any black group, put aside ideological differences, and help communities out whenever he could...but the NOI said no and subverted all of his work before he was assassinated. When Malcolm broke from the NOI, he was free to become the greatest and that's my favorite Malcolm: the one who dropped the NOI's contradictory beliefs and practices and went all over the world spreading Black Communal Marxism and global black community collectivism