Bills go from 3-4 to 4-3 in measured fashion, and look formidable Coaches love a defensive scheme and change. Via Bill Parcells, Pat Kirwan says disaster often ensues. Acquiring the right parts (and landing FA Mario Williams helps) first, then changing is the key, as have the Bills.Got a (Big) Nickel? You'll need one to combat hybrid offenses this fall The defense was introduced by Bill Belichick, but it's the Patriots offense that's sparking a revival. Pat Kirwan looks at the Big Nickel, where an extra safety is the key, and how your team might need it to thwart new hybrid attacks.Welker's smart to avoid holdout, now Patriots should reward him Wes Welker isn't quite an elite receiver but has produced again and again for the Patriots. Pat Kirwan analyzes the franchised wideout and agrees that the Patriots should pony up a three-year deal for Welker.Third-down sacks: Seeking biggest stops a defense can get In an era when passing games rule the day, the biggest job for a defense is to get third-down sacks. Pat Kirwan says that's why finding players who can deliver those -- as the Ravens and Giants do best -- is high priority.NFL pro personnel types now in business of roster-hunting for depth NFL team personnel execs constantly try to tweak rosters for an edge. Pat Kirwan says this time of year, after the draft heading into minicamps, is when front office types look over others' rosters in search of depth.Rookie starters for 2012? Bengals, Bucs, Jags, Browns will have a few Get over the post-draft glow. Pat Kirwan says only 3 percent of picks start as rookies in a good year, but singles out the Bucs, Browns, Jaguars and especially the hot-drafting Bengals for finding three potential starters for 2012.There are stars to be found in the forgotten, undrafted free agents Think undrafted free agents can't make it in the NFL? Perhaps you've heard of Tony Romo. Or Arian Foster. Pat Kirwan is the man who signed Wayne Chrebet, and he's here to give you his top 20 undrafted free agents of 2012.CBSSports.com's Pat Kirwan can also be found on Google+.
