When people think of an A-Player, they often think the person had have gone to Harvard. They don't.
Each position in your company can have an A-Player. The person who cleans your toilets could be an A-Player cleaner. That person isn't likely to be an A-Player lawyer ... but the A-Player lawyer probably wouldn't do a great job cleaning either.
As a hiring manager, your goal is to fill each position with the very best person in that position. If you think of a baseball team, it is pretty rare that the catcher is best hitter on the team. But having a good catcher is really important. And a baseball team also needs a great doctor, a great ground crew, great secretary to handle the fan mail, and even a great person to do the laundry.