sentences:  This is the reason that defensive linemen such as Richard Seymour and Vince Wilfork do not always rack up sack and tackle statistics despite their critical importance to the team.The system is at times more conservative than certain other defenses currently in vogue in the league, despite the constant threat of its potent linebacker blitz.The Patriots defensive system generally places an emphasis on physicality and discipline over mobility and risk taking and is sometimes characterized as a "bend but do not break defense".