There are already 19 initial courses taking place for bases throughout the country- with the holding pool developed for the initials that will be trained throughout the summer.
This winter has been quiet at some bases which would explain why rejoiners are coming back late- and even last year rejoiners were coming back as late as may. The rejoiner course is not 6 weeks long as you know so will take less time.
Many of the bases are over established at the moment, so there is little need for new crew currently. You state there is only 19 permanent crew at LBA- there are still temporary crew there who will be placed somewhere ahead of initials (they count as rejoiners)
And there will be tranfers for crew which will take place over any new initials or rejoiners
