Picobello and Frozen Turtle
No one is going to leave GF.
Many copilots on both fleets A320 & B767 are GCC cadets (Big training bond). Rest of them are lucky enough to have a job with GF since there previous experience was just turbo prop or corporate and again they have a training bond.
Only few of them have no bond including your friend who was contacted by Easyjet. He was hired last year type rated.
Eventually all A320 copilots will have the chance to fly the A330 when the time comes.
Don’t know about the quality of people hired on A330 but that is a different subject.
Good luck with your progressions.