That tells you how bogus his review was. They didn't really think he was an easily replaced average Joe cog, but they had to fill all their various slots and, I suppose in their view, he should have been happy not to have to been allocated to a worse one.
It's grading on an arbitrary curve, not on merit, "There is no way to tailor the rewards of the team to the actual performance of the team."
And then they offered you a promotion to stay when you threatened to leave ?