(Undated)  --  John Schneider of the Seattle Seahawks is ranked as one of the NFL's top general managers.  The "Sporting News" ranks Schneider as the fourth-best GM in the league, saying he's kept the Seahawks a contender for the Super Bowl for the past several years and has them primed for another run this year.  The magazine says the Seahawks continue to be strong on defense and its offense is rapidly improving with Russell Wilson at the helm.  Schneider trails only the Broncos' John Elway, Bill Belichick of the Patriots, and Dave Gettleman of the Carolina Panthers.