i think rover was meant to be. he was going to the same place, freaked out over the stress of it all, but when you arrive on the train he deems you worthy to be the mayor and lets you get off at the station alone. after that, when 'someone' sends you a letter afterwards, only he would know that you were going to be mayor if you got off at that station, so it has to be him, as far as i'm concerned.
