Macheda to me looks built for the lone role, I'd be surprised if that isn't where he plays for the vast majority of his career. If he's played anywhere else he's asked to get involved in the build-up and that takes away from his all-round threat while taking away from our play at the same time. There's not really anywhere besides up front on his own that he won't be asked to get involved in the build-up and he loses the ball a bit too much to want him to.
Looks to me like he's being played there to minimise his deficiencies that'd be shown up in any other role.