It's maximum a day's job to sort the applicants in terms of experience. The deadlock must be between 50 to 60 candidates that are tied on last seat or seats from different quota's. There must be some bottle neck and it must be from NAB side, if supposed that they both are playing fairly.
P.S anyone having any insider news, Moreover if you have any connection in NAB or NTS, can you ask them what is the bottle neck?