This group has been terrible against the run for years. It's the players not the scheme.
Kyle Williams is one example. He is a great player and I love him on the bills, but his strength is quickness off the line and shooting gaps. When defending the run, getting upfield so fast like Kyle does is an all or nothing situation. He either makes a big play, or his position upfield creates huge running lanes.
Other teams running a relative of pettines scheme like the jets and ravens are always very good against the run