No, it's not that simple; for example, since Hanley was injured, Aarons has established himself, Leitner has flourished, with added defensive busyness to his game, and Buendia has been providing solid defensive cover on the right. But, apart from his heading ability at set pieces, I really don't think that Hanley contributes more defensively than Zimmermann when paired with Klose, while, at the same time, IMO, he certainly doesn't improve on Zimmermann when it comes to our playing out from the back.