opups are only given to elites if there isn't enough space in Y (due to overbooks, seat equipment breakage/malfunction, etc).
Non-revs can clear directly into the best available seat and are not op-uped to J.
Op-ups, IF NECESSARY, will process before non-revs clear into J
I've seen a few occasions where GA's have proactively op-upped Medallions but there were more no-shows than anticipated. Once op-upped, pax aren't downgraded, so a standby could be cleared in the newly-opened Y seat.