I don't have any better idea than anyone else about why the individuals concerned were or were not selected. However, one thing that occurred to me at the time the prog was first shown was how I would feel as a potential member of the team being approached.
Presumably the candidates would have had to agree to being filmed, interviewed etc, and personally, I am not sure I would have wanted to be filmed not getting through ... especially given the way we in the mil tend to load banter onto any mates who appear on the TV - "It's That Serious."
Excellent Families Day by the way chaps, good effort despite the cr@p weather.
STH