This is ridiculous. It might be true that there are many great developers that have nothing on github but it is certinaly not true that "actual best developers

This is ridiculous. It might be true that there are many great developers that have nothing on github but it is certinaly not true that "actual best developers have little or nothing to point to on github". There are plenty of "actual best developers" who have prolific amounts of stuff on github, directly or indirectly.