Most defenses match personnel against offense to take away the offense's advantage of having a slot receiver on a lb. That's why teams like Alabama, Florida State, and all the NFL stay in nickle personnel 65% of the time. You can use a safety, corner, smaller faster lb, who ever can get the job done. The school I coach at has this "star" player as a position that is taught with the linebackers and he is covering slots man to man, dropping to a zone, and even blitzing. If we get a guy that plays corner or safety and then moves to the "star" like javier arenas, Mathieu, or Lamarcus Joyner even better for us. If we don't we take a guy and he only plays star and he masters it. What makes this guy work is that we put pressure on other teams not by just blitzing but by pressing our corners, moving our end to nose and bringing a kid whose not good against the run but can pass rush his *** off in the game. This way he doesn't have to cover somebody for 7 seconds. We have a defensive rule that if a play lasts for 7 seconds most of the time we messed up. Get your *** from Point A to Point B in 4 to 6 seconds. Just two cents from a dude that coaches lower level college football.