With the Patriots bringing Dom Capers aboard as a special assistant/secondary coach, colleague Christopher L. Gasper makes the point that this is somewhat similar to the team hiring Bill Belichick as assistant head coach/secondary in 1996.
It is rare to have the opportunity to add someone with Capers' experience and expertise.
Most intriguing from a pure Xs and Os standpoint is the potential fusion of ideas between the traditional Belichick 3-4 defense and Capers' pressure-based 3-4 defense. Capers has a well-deserved reputation for generating heat on the quarterback in a variety of ways.
Furthemore, Capers' presence could allow Belichick the freedom to focus his attention elsewhere. It was common to see Belichick scribbling on the whiteboard with defenders during games, at the same time the offense was on the field. While Dean Pees remains the team's coordinator, Capers could also take on some high-level responsibilities based on his experience, thus freeing Belichick.