Best LB of all time... Bill Romanowski? He is tied for the most rings, and has the most Super Bowl starts of any LB. Clearly, then, he's the best; it has nothing to do with playing on the same team as Montana and Elway.
I agree with everything Dons said, including about the HOF. If it took Harry Carson -- a 9 time Pro-Bowler, who Bill Belichick called the best all-around LB he ever coached -- 12 years to make the Hall, then Bruschi is never getting in.