Found by BradyManny: FOOTBALL OUTSIDERS: Football analysis and NFL stats for the Moneyball era - Authors of Pro Football Prospectus 2008 When teams run against Seymour's side the Pats have the second best running defense. When they run at Wilfork the Pats are 14th in run defense. I grant that the weaker inside run D may also be related to Mayo still learning and Bruschi on the decline. Is it possible that Belichick selected Ron Brace not just for insurance or to develop as a backup, but rather to eventually fill what he sees as actually a weakness on the team? This off-season is like the 2002 off-season, in which Belichick didn't make the playoffs, had tons of time to self-analyze his own team, and then made major changes to address weaknesses he found at certain positions. I think tight end and cornerback are other positions, in addition to DT, in which he wasn't happy with what he saw on tape.