Shawne Merriman: “I feel good … I’m back”

Cut Bills linebacker Shawne Merriman’s six-year NFL career in half, and you’d think you were looking at two completely different players. In Merriman’s first three seasons, 2005-2007, he was one of the best defensive players in football, recording 39.5 sacks. In the last three seasons, 2008-2010, Merriman has missed more games than he’s played and…