Depends. Sometimes such a person is on a team of juniors or truly inferior colleagues. I've seen the former a few times but never the latter. Sometimes, and more often in my experience, such a person simply thinks they're superior, they take much more than they should or can, and make every one else's job harder.

In the case where the individual truly is more talented they don't need to profess it aggressively. It will be quite clear in feedback from colleagues to their boss and by the quality of the their output.