We know the heads of Marxism are usually Marx, Engels and Lenin, often plus Stalin and Mao.
But who would be the five heads of revolutionary liberalism (before it became a totally bankrupt, anti-emancipatory, status quo project)?
My suggestion: John Locke, Thomas Paine, Robespierre, Toussaint, & Simon Bolivar
Also considered: Oliver Cromwell and Garibaldi
My idealistic guess would be the philosophical split between rationalism and empiricism, which is a lot less pronounced in Marxism. See: Where Do Correct Ideas Come From?
I don't know what material factors would influence this division