[hinkley]

I’ve known developers who couldn’t do certain hard tasks no matter how long you gave them.

That fact notwithstanding, I’ve never met someone more than 4x faster than anyone I would consider adequate. Maybe that says I have demanding standards (likely). Maybe that means I’ve never been in the presence of great developers (less likely).

What I have met is people who value their own productivity over that of the team. They create code that slows all but themselves down. The more clever the person the worse the damage. I have no doubt that such a one could force a situation with a ten to one ratio, especially with developers without the self esteem to push back.