Big E,
EZY operates AMS-BCN, AMS-NCE and all other routes with Swiss and UK crew, not Dutch ones!
The Swiss part of the operation is totally different from any situation in AMS, as they were acquired in the past to establish a presence there. Nothing is being acquired in AMS with that respect, just a base on through routes.
No crews based AMS for the forseeable future! All Dutch pilots continue to operate from UK and Swiss bases, soon to include in the UK EDI/GLA/BFS and LGW, too.
The future will hold the answer as to when/if eJ are to base crew in AMS. We'll wait and see.