Looking for a reason why Tom Brady, in the past, has made his receivers earn his trust before he delivers them the ball?

How about this -- The first thing, as Bill Belichick explained today, the quarterback in New England's offense is to look for usually isn't a receiver. It's the defense. And the defense guides him to where he'll go. So when he gets past that step and to the receivers, Brady needs them to be where there supposed to be, particularly since their routes adjust based on the coverage.

Maybe I did a shoddy job of explaining it there. So here, I'll get out of the way and let Belichick explain how, really, there's not a primary receiver in most pass plays New England calls.

"There’s never a primary receiver," Belichick said. "The quarterback reads the coverage and then that takes him to a certain part of the pattern. And then based on how they play that part of the pattern, he either reads it from high to low or low to high, inside to outside or outside to inside, depending on how the route’s designed. If you put everybody over here, there’s no primary receiver.

"The only time there’s a primary receiver is on a screen pass and that’s the ups and downs of the screen, you only have one guy to throw it to. If you get it to him, you’ve got a play. If he’s covered than you’ve got nothing. Other than screen passes, there really – in our passing game – you might think there’s a primary guy because if they give you this coverage, which is what you’re expecting, that would be the read and that’s where it would take him, but if they played something differently the player would read a different receiver or a different set of receivers. "