The best Patriots team (2004) had it all, a run game that defenses had to respect, a defense that was physical and opportunistic, and the special teams weren't too bad either.
Right now I think we have two of the three... the Pats ST's are pretty special, the defense (while young and inexperienced) is fast, aggressive, and opportunistic.
The Pats need another CD, he had the power/speed combo that made that offense run, especially late in the year which helped out our average WR core. If they can get a true #1 back that defenses have to respect, our WR's will look infinity better (IMO).