Their own example is an example of this. I've heard the name Fabrice Bellard but don't know who he is and don't know why I'd care, but Guido is a well-known name among python users and does hold weight. Looking up what Bellard is known for, I kind of expect this to be true of more people than not.
He's not as visible. I know those projects, not the people behind them. I don't know most of the people behind Python either, but I know Guido because his name keeps coming up when the Python project is talked about.
