Bill, teams that are strong all around are the teams that win.
The Pats* have had some great DBs as part of their run. The Giants had a strong secondary last year. The Steelers had Clark, McFadden, Polamalu, Taylor, Townshend - another strong secondary. The Bucs had Ronde Barber, Brian Kelly, John Lynch, Jermaine Phillips, Dwight Smith, Corey Ivy.
Almost all of the teams that have won the past several super bowls have been solid all around, not just on the lines Bill.
Teams that build solid, well-rounded teams are the teams that win championships.