I have had 2 that I absolutely cried when they left (left to join their mommies on mat leave, will be returning too but it still upset me to think they were going away for a year). I have some that I would be thrilled if they left lol and the others I really like but have no real attachment too. If they stay that's great because they are good kids, but if they go, that's just life. I try really hard not to develop too much of a connection with them because its just too hard when they go!