Fellaini scored 8 goals in his first Season at Everton.Not really till his 2nd / 3rd season did he look anyhing like doing that.
He had fleeting moments, in a decent side. So was allowed the space to breath.
Also played further forward with not much responsibility.
And againb, had much better players around him.
Now granted he was played further forward, but he still made a vital impact in games.