Palmer is the only one who when he left has immediately kicked on. I don't think it's a coincidence that he was the one who spent the most time around the first team at City and when going to Chelsea, has found it a lot easier to stand out because most of their team was crap last year.
Lavia, had some half decent performances for Southampton but he was in a relegation team. Been a permanent crock for Chelsea since.
Rogers and Delap had several loans, didn't impress on any of them. It's not always linear progression but very few can say they saw these levels of performances coming since then. Especially Rogers. Delap always looked a handful enough that if he got some service he could score goals.
I want McAtee to play as much as anyone but we have to trust he's just not doing enough for Pep. Right or wrong, that is the reality. Pep will have no problems playing the young lads if they make it impossible to ignore.
If McAtee goes to West Ham and tears it up then good luck to the lad, but he is behind several top class players here and he won't be at West Ham, that alone is making it much easier to stand out.