This is a great topic and one I was saving for one of my weekly Reading the Defense in-season columns.It's partly your imagination, as there has always been a cyclical nature to things in the NFL. There were hybrid players in the past. They weren't often labeled as "hybrids" and they weren't always the same hybrids and tweeners you see today, but they were hybrids nonetheless. The middle guard morphing into the middle linebacker. Defensive backs morphing into separate cover guys and run support guys -- and now back again. The advent of the nickel back and dime back. The 46 defense introduced the hybrid SS/LB player -- before quickly flaming out after the West Coast offense destroyed it as a base scheme.Ronnie Lott and Rod Woodson would have had Len Pasquarelli writing articles about the "new breed of safety" in the late 80s. Bryce Paup and Greg Lloyd and Brian Greene and Pat Swilling would have (and did) spawned discussion about what LT did for the 3-4, once staffed by big OLB meant to keep bigger, quicker backs from turning the corner become a way to pressure the passer.20 years ago, 75% of the league ran a 3-4 front in their base defense. Until recently, there were less than five. Some of that is teams re-discovering the flexibility in pass rush the 3-4 provides. But much is also due to the Bobby Bowdens and Jimmy Johnsons of the college world putting an emphasis on speed in their college defenses. Players get smaller and quicker and fit different defenses better than others.Bill Belichick, no stranger to gameplans that try to dictate what an offense is able to do against his defenses, has said that team defense is all about reacting to what the offense is doing. These hybrids are the next "reaction" to the highly specialized multi-package offenses -- four and five WR sets, pass catching TEs, change of pace backs, vertical offenses and ball control offenses -- defenses have to deal with each week. Hybrids offer flexibility. Winning schemes breed assistant coaches that become head coaches. And, as more teams seek the same type of player, the quality of the schemes suffer.The Steelers and Panthers found the personnel to run the zone blitz out of a 3-4. The Texans couldn't. It remains to be seen if the Browns can do what the Patriots have done with the Belichick hybrid concept. The jury is still way out on the Lions and the Tampa-2.In another ten years, there'll be a new "hybrid" player and a renaissance/tweaking of an older defensive scheme. Staying ahead of the trends and understanding why they are happening will be key to fielding a good IDP roster. And, as Rovers began to push for next year, may cause some tweaking of roster, rules, scoring and lineups in the future, too.We hardcore IDPers and football fans know the truth. Those who just watch what the quarterback does with the ball are missing out. In a big way.