Apologies for repeating myself, but:
Enrique - loaned him out, then wanted him back
Emery - no real reason to play him given that he was in a winning side
Villanova - gave him his debut (and was actually the only Barcelona manager to pick him)
Koeman - picked Lennon, Valencia and Cleverley instead and persisted with a system that wasn't working for most of the time Geri was here
Martinez - loaned him, had a good first season out of him playing one style, then brought him back and played a different style
Deulofeu needs playing time to develop; its been obvious ever since he first came here. Playing him in bits here and there never works.