You have to play both to be a good CB; you can't let the other guy 5yd arm push and run pass you, and you can't just play their hands when the ball dropped right in front of you if you ever look back. Cary William or the old Jimmy Smith not letting his WRs beating him much but they always haul the ball cuz Cary or Jimmy don't track for the ball. The new improved Jimmy never let his WR get behind and he plays for the ball at the same time. Basically, you don't want WR get behind you but at the same time, you don't play their hands when you are neck to neck with him. You're saying not letting WR beat you in the route is just the first phase of being a CB; a little more advance is that you have to be able to track for the ball. If you know where the ball is going to be, who cares about the opposing WR when he is running the wrong route. To be able to track where the ball is need serious skills and hard work....... Webb is used to be a very good ball tracker until he went down with his second ACL...... PS: Additionally, I can't forget Webb intercepted Brady's pass to Elderman in AFCC when Elderman was clearly behind Webb but he jumps up and haul the interception.