The model I like to think of this is that intelligence is speed and knowledge is distance, but you start at the peak of a mountain and the farther you go the slope is increasingly getting sharper, so you keep getting faster.
Terrance Tao is a genius. He can go from sub-field in math to sub-field in math and solve a problem that stumped someone dedicated in that sub-field for years. But he is only able to solve those problems because of the understanding that the sub-field expert developed over those years in addition to the broad context that he has developed jumping from sub-field to sub-field.
He started with a lot of speed. As he's worked with more individuals, he's covered significantly more ground that other people, which has compounded to make him unbelievably fast.
One of the main take-aways from this model, is that if we are in an economy that only allows the wealthy Einstein's to flourish, not only are we losing the poor Einstein's we're quite literally slowing Einstein down.
We must do everything we can to ensure that we find smart dedicated people and allow them to thrive.