3P, you may be right to a point but how many of your DE NCA got in on the first presentation to OASC? Jamie may indeed be better off enlisting first.
As for having to wait 4 years or more that is not a huge amount of time and can be experience well gained. As for amortisation, if they need bums on seats then I am sure they would consider him sooner rather than later.
It would be entirely up to Jamie how much he wants it and lets his boss know.