It’s hard to be a number one receiver without having supreme belief in your own abilities. In order to be great, it helps a lot to believe that you are capable of being great, that in any given situation, you have it within you to make the play that is needed to be made. You know internally that you’re not going to make every play, but you also know that you can make any play.
This may be true for the wide receiver position more than any other on the field, which contributes to the ‘diva’ narrative that, frankly, has a lot of truth to it.