Who says it's purely FPP from now on?
There was to be quite significant ongoing DEP recruitment but then BA bought bmi and put a temporary end to that. Meanwhile - FPP cadets were already in the pipeline.
Quite rightly, in my opinion, BA have honoured their commitments to the cadets that had already started and they've started FPP recruitment again because the lead in time is so long.
I wouldn't be at all surprised to see DEP and Managed Path open again over the next year or two. All three routes have their own positives and negatives and management have always said each route has it's place in the overall recruitment plan.