MOTN, exactly. You are in competition for the number of slots, be it Int, Logistics, Pilot or whatever that year.
Miss PN2 was a strong candidate who wanted Int (her degree was relevant). She was privately interviewed post-OASC to see if she would accept Supply where she would be assured of an offer.
Later, as the overall president at OASC, she had to advise Boarding Officers that there was no presumption that anyone in their syndicate would be accepting and that all might fail. OTOH they might have an above average number of suitable applicants.