Staff in all posts except flight / cabin crew. Probably some offices etc aswell. I'd say that today every penny counts to every airline - all will be looking for savings wherever possible.
My understanding is that EZY crews are largely self-administering and there are very few if any staff or offices on site at airports. If you do consolidate, you surrendering market to your competitors who can offer more choice. You also lose the adavantage of playing operators off against each other.