Know this is a year old, but FYI - I was class of '92, graduated '94 and selected '94 at time to be on ring (b/c well, that's when I graduated). Would have preferred '92 now...
I did attend 2yrs, left 2, then returned to graduate...so maybe the frog (transfer) status has legs and allows flexibility (or did for a few years in '88-'92-ish).
I do recall them asking me which year I wanted on the ring and I thought for a sec...so seemed normal at time. Have been told by others as above that wanted to change and they weren't allowed...