It’s often said the NFL is a copycat league. What one team or unit accomplishes in any one phase routinely becomes a blueprint for general managers and coaches across the landscape. (That, of course, is provided such schemes can be replicated and applied on a wide basis.) The NFL is also a league of adaptability. When the standard offense is centered around a three-receiver set, including a playmaker in the slot, the standard defense has to respond with at least three competent cornerbacks. Not possessing a quality defensive starter in the slot might as well be a death sentence.