Nuageblanc,
Some who came from Bae146 and Embraer were taken on as direct entry captains. Some of those did some stupid things on line and at least one lost his job because of this. After those incidents EZY went back to the old scheme, above 45 tonnes aircrafts to be concidered for DEP, so I was told at least.
When I joined EZY I had +4500 hours and still I was put on TRSS, I agree with you it's a silly concept and I don't like it.
However it does help putting these guys into the right seat with an experienced EZY captain to start with, rather than putting them straight into the left seat of an Airbus. A much better combination than putting the Embraer guy in the left seat with a new cadet in the right seat. That's what EZY did and the outcome wasn't good and that's why to my knowledge this has been stopped/ doesn't happen anymore.
I hope this helps your lack of understanding.
TFCM