They don't rebid them here, unkunl someone else takes a bid in a different classificationIt may have been a bad analogy for your area.
Point is each classification has its on seniority list. When you rebid you will also be above any high seniority driver that may decide he wants a 22.3 position because you have a higher classification seniority.
You're actually pretty lucky. It takes almost 20 years here to get a 22.3 position.