Forgot to mention. I usually offer the f/o the opportunity to make the PAs, other than the mandated "prepare for t/o or landing". Most turn me down. On the other hand when I offer to do the walk around, most say go ahead.
Back on topic, we have many f/o s who have check airman experience on the A320. AA would rather have an AA captain with no A320 experience as an instructor than hire very experienced, former A320 captains, that are now recalled to AA and sitting in the right seat.