"You have different combinations of coverage and it’s really important that that receiver and the quarterback see things exactly the same – when to keep going, when to slow up, when to stop, any kind of option routes, which way to break, when to come out of it. It definitely takes some work," Belichick explained.

"The visual communication between those two players is, I think, more difficult," Belichick added. "I’m not saying it’s easier outside; there are just more variables inside. Again, especially when you get into option routes and decision making, you’re just going to run five yards and run across the field and that’s fairly straight forward although there is some, ‘Do you go over? Do you go under? Do you slow down? Do you speed up? Do you stop? Do you throttle? What are your rules? What tells you to do what?’ Most importantly, it has to be exactly what the quarterback thinks you’re going to do so you don’t go behind the linebacker when he thinks you’re going in front of him and it’s a bad interception, that kind of thing. I think there’s a lot to that, yeah. I think it takes a lot to play that position.