This doesn't specifically apply to mg's opening post, but is more in reference to the coaching staffs of all three phases of the game.
It appeared at times this season that the Patriots were very predictable, making it easier for opponents to put their players in position to succeed against the Pats. Much of the pre-game preparation had historically been handled by Ernie Adams; that is now done by Matt Patricia.
Following a legend in his field is never easy, so it would be unrealistic to expect Matt to immediately be just as effective as Ernie. That would show up downstream, where the Pats may be predictable, or seem ill prepared to react to what an opponent was doing (such as the NE defense vs Buffalo offense in the postseason).
With that in mind, how about adding more staff to break down film and look for these tendencies - not just in regards to what an upcoming opponent is doing, but just as importantly, self-scouting in order to preemptively fix a habit or weakness that an opponent could see and exploit?
These 'Quality Control' positions are in the grand scheme of the business relatively low paying jobs, and they don't count towards the salary cap. If they result in more wins then that adds to the value of the franchise, making them a worthwhile investment. The information they uncover could be vital for an OC, DC, Special Teams Coach or any of their assistants while preparing for a game.