I would be rather miffed , if having recently applied and being told that only the A320 was available, and having signed up (complete with 5 years freeze) to find my buddy applying this week and getting offered B777 or even A380 !
That is how it works I'm afraid. How miffed will you be if that happens, so you serve your five year freeze on the A320, put in your bid for long haul, and discover that a brand new DEP buddy gets a position on a long haul fleet and you are told you have to be retained on the A320 due to a lack of training capacity? Yes, that happens too I'm afraid.