In theory a person waiting 4 months to join would outwardly seem more determined than a person that passed on Friday, starts on Monday.
That said, some RN branches have waiting times in excess of 24 months. Upon entry, there are several types: some absolutely determined, some disappointed with the job after the long-awaited anticipation. Finally there's those who maybe a bit lazy, stop training and stop looking for work in the interim - these are the group most likely to quit early doors.
I think there's definitely a lot of factors at play now, particularly due to COVID causing huge unemployment and various services offering various waiting times etc, that can influence whether someone chooses to wait or not.
I won't go much into my situation as it may end up becoming a massive drip and derail the thread more but after spending most of the year simultaneously unemployed because of covid (the odd temp job when they have work to offer) and in a drawn-out RM application process spanning nearly 12 months already, meanwhile being offered almost immediate start dates for multiple army roles (some of which can do AACC or P Coy), I really can sympathise now with those who take a quicker route and to be Frank I'm not ruling it out any more myself. Previously life was entirely about the pursuit of the Green Beret First and foremost, with the career benefits a fairly distant Second. 2020's curveballs and upheaval of life, combined with getting older, have for the first time in my life made me realise that I need a solid career first and foremost with earning a CGB being a very special cherry on top.
Not meant to be a drip or rant and certainly don't want to be seen as not being "all in" for the CGB - I've spent long enough in my life pursuing it to rigidly defend my commitment to earning it - but perhaps some food for thought on why some candidates may abandon ship in these current times!