The Atlanta Falcons have reached a contract agreement in principle with unrestricted free agent linebacker John Holecek, a six-year veteran who should aid the team’s transition to a 3-4 defensive front. Holecek, 29, played for Wade Phillips when the Falcons’ new defensive coordinator was the head coach in Buffalo and becomes the second former Bills starter to move to Atlanta in free agency. The team earlier signed safety Keion Carpenter, a three-year veteran.