One thing that people overlook is the advantage that stimulants give you in short sprinting. I read years ago that the caffeine in two cups of coffee could give you a 2% increase in performance in the 100m. In the upper echelons of 100m sprinting, 2% is huge (around 2/10's of a second). Steroids help by increasing muscle strength, but sprinting has a neuro component (reaction time, neuromuscular response, etc). Stimulants increase this neuro response. Since Lewis was using stimulants, one could argue that he had just as much of an advantage as Johnson on steroids.