For anyone that didn't know when corners play press coverage and use inside leverage they are forcing the WR to the outside and any inside routes will not be run because of the leverage the corner holds. (that is if the maintain it)
When a corner lines up and plays with outside leverage he is forcing the WR to the inside (usually to the safety help in the middle) so this will prevent any outside breaking routes the WR can run.
All of these techniques rely on a corner that is physical at the LOS to redirect the WR across him. Rob Ryan's scheme needs this type of corner in order to run his blitz packages correctly.
"It's little bit like the description of pornography from years back. It's hard to define it. But you know what it is at the end of it. It's hard to define it. I think you know who is more physical. Often times you see that in the fourth quarter. A lot of time the team on the other side feels it. We pride ourselves on being a physical football team. It's important to us. It's an important time of the year to lay that foundation." - Coach Garrett