Vacancies and Attitude make the differance. For Vacancies read LUCK!
A grafter that has not made the grade but worked his nuts off will get a better deal than somebody who things that they are gods gift to aviation. I know of a Nav who is still a Nav only because he said the wrong thing overheard by the wrong OC whilst on his SH Fast track pilots course.
FJ ethos is very differant to multi crew and if all were to graduate from Valley before coming to SH, it would not be a better place for it. That said, those that have travelled this road recently have done very well for themselves.
If you are chopped, my advice would be to wind your neck in and bite the bullet, whilst descretly researching if there is any element of the training system that has let you down. If daddy is at star rank, that helps!