Howling:Rory returning

We all know that Rory is returning. But how in what capacity. He was absorbed by the cracks right but he died before that happened. So its not like the effects of the cracks can be undone and he will be back. Does this mean that certain events of this series will be undone. completely not just eaten up by the cracks. Also is he just returning for these episodes or is he gonna be back full time. User/Winehousefan