Well, Joe Hart is still a young goalie, makes some mistakes, to be honest i prefer Kasper to Joe, but Well...
Shay given is what 33 or something still has a good 4years ahead of him, and he will teach alot to the two young man, the best thing for Kasper was to stay with Sporting Lisbon, after his dad moved to City he followed him, but if kasper stayed, he would learned so much there, have a look at the list of stars that Sporting academy[possibly the best at the monent in the world].
Luis Figo
Simao
Ronaldo
Quaresma
Moutinho
Nani
Veloso
Futre[older player]
and many others.