What I really think is going to happen with Ross, is that he's going to stay as a missing person for few months to come. Mike Parr will that way have a nice break too to try out new things -maybe Strictly? ;)
Pete panics when Emma and James go to mortuary to identify the body, and under pressure ends up telling the truth(or some of it-that they had a fight and he left Ross for dead..), later when the body found turns out not to be Ross and everyone knows what Pete has done, they turn against him and Debbie wants him out, even thinking to call the police. That's why James is begging Debbie to give Pete bit more time. Pete goes to check where he left Ross,maybe thinking to bury him properly- only to find out that he's not there. This takes Pete to a very dark place. His family has turned their back on him, Debbie has left him..He's struggling with his guilt and now even panicking about Ross coming back. I have a feeling that Mike Parr has indeed left the show-but hopefully only temporarily.