No. Back when the steps were established swings used to get a higher rate than regular couriers, plus a 30 cent swing differential. We would get a raise on our rate of pay but the 30 cent differential would remain constant. Then, when they established the step system, they rounded everyone up to whatever the next step was above their current pay. Lucky for me and many others, they added in the 30 cent differential to figure out our steps, which for many of us, myself included, resulted in being one step higher than couriers hired at the same time as us who were not swings.
Hope that clears it up.