[sorry to quibble over semantics, but it was too obvious an opportunity to pass p]
The idea that progress has directionality is just a metaphor to aid visualization. It has no basis in reality. Your argument is a logical fallacy; I forget the name, but it involves using the same word in two different senses.
Moreover, to say that freakish geniuses "change" the world would be a truism, except for the fact that "the world" doesn't actually change unless everyone else follows the freak. So the parent comment has merit -- you need the people who do weird things, and you need the people who do the hard work of filling in the gaps. Progress is defined by the movement of the whole, and not the movement of an individual.
If we have a clear idea of what "pushing the human race forward" is (more knowledge? less famine? better morals?), then somebody can be the 'best' at it - even if they are the best by being somehow innovative.
I'm not sure that this is a fruitful discussion to be having, though - except that people often seem to talk about progress without reflecting on what they mean. Besides, you started it with "push the human race forward" ;)
Similarly, no one who is the best at something can ever, by definition, push the human race forward. Because to be the best at something means you have to be, by definition, doing the same thing as everyone else. C.f. here:
http://reddit.com/info/14l86/comments/c14o44