This false statement is getting repeated far too often. Cook is somewhere between the 3rd and 5th best player on the Bills offense, factoring in our offensive linemen.
In my opinion, Josh is (no surprise) #1. Dion Dawkins is #2. From there, it is very debatable, with Spencer Brown and Connor McGovern in play.
The "pay Cook" and "2nd best on offense" mantra is a Fantasy football and Madden mentality. He is very good, and I hope we keep him at a manageable cap hit. However, our offensive line is, collectively, the 2nd most valuable component of our offense, allowing us to win with Davis and Johnson at RB.