Not so sure about that!
If I have to pay German taxes, why should I pay for a british social security system furtheron which is not as efficient as the german one(but more expensive, agreed)
At least for the pilots staying longer in Germany, on the long run, it will have more advantages.
Of course, EZY has to pay a higher amount to the german social security.
That is why they are probably not in a hurry at all.
But if so, they will try to bring, what they probably call "market competitive salaries". Interesting times ahead!