It could be is that the "ultra-productive" folks (except Ninja, who is real person), may be actually collectives, like https://en.wikipedia.org/wiki/Nicolas_Bou

It could be is that the "ultra-productive" folks (except Ninja, who is real person), may be actually collectives, like https://en.wikipedia.org/wiki/Nicolas_Bourbaki https://en.wikipedia.org/wiki/Nicolas_Bourbaki