It's true they Leninism hadn't always been dominant, but it did spend a lot of the twentieth century with a dominant position in left wing thought even in the West, which is somewhat ironic since it is largely an adaptation of Marxism to work outside of the developed capitalist world, which arguably, aside from whether it worked to achieve it's theoretical goals, never had relevance to the West.

It is the escape from that dominance that is the Renaissance, and, yes, as a rebirth, it is naturally prefigured by conditions that existed prior to what it is an escape from.