What the aircraft is cleared to do and what the front line and training system can develop and sustain so that its crews and instructors are capable and competent is another matter entirely and is likely the sticking point in moving forward.
Surely that's a limiting factor for all aircraft types, and not intrinsic to the A400M. I'm not sure how that observation either advances or negates the case for retaining or getting rid of the C-130Js.