I agree with you on the Dolphins but not because of the losing decade of the 70's. What made the Dolphins the Bills biggest rival was the Kelly-Marino years and all of the playoff battles these teams have played. NE was just like the NYJ a divisional rival for sure but there was no real rivalry. The Pats kicking the crap out of the Bills during the Brady years wasn't a rivalry. I would bet during that time the Pats thought of the Colts (Peyton), Ravens (Lewis), Steelers (Ben) and Broncos (Peyton) as bigger rivals then anyone from the division. The Brady Pats looked at the Bills, Dolphins, Jets as Moe, Larry, Curly.