The timescale for the throughput of the FPP is long. At least a couple of years. Add onto that the failure factor and you have a system that 'might' or 'might not' return a usable 'ab-initio' product in a few years. Thus the 'lead in' needs to be long.
BA will always 'spread bet' against age, experience and return. Thus DEP will always be available, however, DEP's can be fed through to the line in a couple of months therefore the 'lead in' for DEP recruitment is justifiably shorter and more volotile. Think, reactive, not pro-active.
There will be more DEP but when and how many are variables that can be discussed at very short notice.
