When UPS sought the two-tier concessions in '82, no one voted to cut their own pay then, or in the future. Assurances were given, as reflected in the higher pay in classifications for employees hired before the '82 contract(red-circle pay). It certainly was not contemplated then that there was any threat to full-timers of an attack on their seniority from the new tier. Higher seniority trumps lower seniority, and full time seniority trumps part time seniority. How does it make sense any other way?
How does it make sense that a part-timer of five years, has a right to a new job before a full-timer of twenty-five? Why would UPS pay top pay one time, then when you move to a higher classification and then back again, to the same work, get to pay you less than before? Didn't you gain experience, knowledge, maturity, and seniority. Where does that idea come from?
You get the argument that art. 22 is just for part-timers. Only if you don't read it right, and you don't care if you distort seniority (which will destroy the union).