Came across this, and Nick Buoniconti got the call for the Patriots:
Yardbarker's best-of NFL positional series continues with linebackers. This does not cover pure pass-rushing threats -- we will get to them -- but rather true off-ball defenders who thrived as traditional inside and outside 'backers.
www.yardbarker.com
"All due respect to Bill Belichick pieces Tedy Bruschi, Mike Vrabel and Dont'a Hightower, Buoniconti is in the Hall of Fame after doing his best work as a Patriot. Perhaps better remembered for his stay on Don Shula's legendary Dolphins teams and for his "Inside the NFL" contributions, Buoniconti started his career with the Patriots and earned four of his five first-team All-Pro honors with the franchise. Known then as the Boston Patriots, the AFL club received superb Buoniconti work; 24 of his 32 career INTs came as a Patriot. The middle 'backer is also retroactively credited with 18 sacks with the franchise. The Pats traded him to the Dolphins in 1969."
The article states that its list "does not cover pure pass-rushing threats, but rather true off-ball defenders who thrived as traditional inside and outside 'backers". With that in mind I would have to eliminate guys that were more OLB (Mike Vrabel) or edge players (Andre Tippett) for this list, giving Tippett the nod in that category.
So any Patriots being given consideration have to start with Nick Buoniconti. But given that this is a team-by-team list, that also means that we cannot take into account everything he accomplished in Miami.
Buoniconti was named to five consecutive All-AFL teams while with the Pats. But he also greatly benefitted from the league's best front four: Bob Dee, Jim Lee Hunt, Houston Antwine and Larry Eisenhauer. I'm not trying to disrespect Nick, but that is a reality. Those four in front of him helped a whole lot.
Clayton Weishuhn was a beast of a tackling machine, and would have been another all-time great if not for his injuries.
Vincent "The Undertaker" Brown is very underrated due to having played so long ago, and on some not-so-good teams. But from 1991 to 1995 he
averaged 122 tackles per season, including what is probably a team single season record of 158 in 1993. Bill Parcells convinced him to return early from knee surgery 'for the good of the team' and it ruined him, his career over after only eight seasons - otherwise he would be far more well known.
Steve Nelson was an excellent all-around player, another tackling machine. Nellie was a team leader and clutch performer.
There's nothing I can say here that hasn't already been said about Tedy Brushi, "the perfect player" as Bill Belichick put it.
And has been mentioned previously, there is no 28-3 without Dont'a Hightower.
It's a very close call with no wrong answers, but my vote goes to Steve Nelson. This is an individual award, so the fact that he played in the 70s-80s rather than during the dynasty years should not be held against him.