Original minds do not find satisfaction in being derivative. Searching for truth leads to originality for this very reason. So it is safe to say that Socrates was a novelty in the human race because of his philosophical turn towards examining moral knowledge, which there was no previous recording of. I guess I don’t see the point in questioning it, chiefly because such genius is normally a culmination of rare and successful inter-generational cultural growth, so it really is “one-of-a-kind.”