Silly statement.
Most players thrive more in certain setups with specific types of teammates.
It's not like Morata has scored 0 goals this year. He has 8 goals-6 assists. However, he clearly missed playing with a Tevez Style forward. Will he be able to overcome this? Maybe. He's shown flashes, but needs to consistently be more intelligent with the ball, and not get all flustered dribbling with it at his feet. He has constantly run straight into defenders this year and lost the ball.