Some players are just not meant to be for the big clubs... and maybe Gila, Gorky and Borriello are that types. Ofcourse, its easier if the team depends on you and is positioned around you (gila at parma, boriello now at his team) and have FAITH in you (again, gila here has no faith from teammates and supporters lately)
And like centre said its true that gorky looks unsure with the ball. Whats the cause of it is our personal opinion... i understand a club like milan wont give young gorky's and boriello's regular play if they dont clearly deserve it, they just cannot afford that. But it pisses me off when you have no alternatives, loosing games regularly, have unmotivated players on the pitch and hungry youngsters on the bench... but you dont try to make the change.