They're two of the GOATS and they're on the same team, that's what makes the team so good.
And they both excel at the same thing, preparation. Bill has the team prepared for their opponent, while Brady knows where he's going with the ball once he sees the defense and makes a read. Amazingly, they somehow get all the other skilled players on the same page. The one exception I can think of was Ocho Cinco (Chad Johnson). Ocho made a lot of bad reads and bad breaks and ran bad routes, Brady would throw him the ball and they'd miss, but you can always see that if Chad made a different read it was an easy catch. Used to be frustrating to watch. He caught 47% of his targets, while a guy like Edelman is closer to 70%.. Randy Moss, a deep ball specialist, was over 60% with Brady