I think the folks discussing whether or not 10x developers exist are missing the more basic point here. In most companies, a manager's status is determined almost entirely by how many people he or she manages. It's absolutely in their best interest to hire more mediocre people than fewer exceptional people because the correct incentives haven't been put in place for managers in the company.
At many places, the best thing that can happen to a manager is for their team to become "too big". Oops, now they have to split it into two teams, and suddenly they're a Director instead of a Team Lead (or whatever titles are used).
At many places, the best thing that can happen to a manager is for their team to become "too big". Oops, now they have to split it into two teams, and suddenly they're a Director instead of a Team Lead (or whatever titles are used).