They're different kinds of player though. Oezil can't carry the ball like Goetze can, he can't see and create on the run like Goetze can. For me, Oezil is someone who has absolutely exceptional movement and great awareness of what's happening around him, similar to Bergkamp, Goetze is more Messi in style. I also don't think Oezil will ever be a prolific goalscorer, whereas Goetze might.
