Darwin was something of a plodder who get's a lot of great press. He did not really come up with the idea of evolution, just came up with more support, a convincing argument, and most importantly communicated this to a wide range of people. https://en.wikipedia.org/wiki/History_of_evolutionary_though...
It's kind of the great man argument taken to the extreme.
I mean, if you have a definition for "a genius" that likely ends up excluding Bach, Escher, Darwin - then something's fishy about your definition.
In terms of communicating with the others, that's akin to having a definition for "great basketball player" to which Jordan doesn't fit.