‘"The biggest change in football in the last seven or eight years has been the defenses and what they do to you. The way they attack a quarterback is much more varied than it was 15 or 20 years ago, and that’s made it tougher for the classic drop-back quarterbacks. Offensive linemen now are big, strong guys who are not as athletic as the guys we find on defense. The guys rushing the passer today are generally better athletes. They’re faster and quicker and that’s made it unrealistic to ask an offensive line to hold its pass protection for five seconds the way the Raiders did when Plunkett was playing."’