I am new to WS and have been hesitant to post but I have been following this from the beginning. I have always thought that RM left on his own however, I do not believe that his leaving came as a total surprise to IM. I think there is a good possibility she may have hidden his wallet from him (maybe the night before or that morning), thinking he would not leave the house without it. That is why it was originally stated that he left it at home that morning. His return to the house could have been to find his wallet and of course to leave the phone that belonged to his employer. IMO RM drove the car to the train station, as for the seat being pushed forward (If that is true) I think it was to remove a suitcase or duffel bag from the back.