Whenever people say that the “10x developer” is a myth, I point them to Fabrice Bellard, who would easily be 100 times more productive than your average developer at pretty much any task you give him. The sheer diversity of problems he’s solved with extremely high quality software is astounding.
True, he’s mind-bogglingly amazing. Also still probably not a helpful example to developing a sane working group or good office dynamics. He’s a unicorns unicorn.