I don't see it as any different to any other vacancy notice.
If there's 1 400 CAPT slot in BNE, and the top 5 eligible people bid, only the highest gets it. You don't give all 5 a Command, and then kick off the bottom 4 400 Capt's.
The training dept doesn't have anywhere near the resources to retain 50-100 pilots. Not to mention the cost, which is the whole reason we started down this path to begin with.