So if you and I both went to the train station (though we are starting from two different cities), and randomly started picking locations of travel, even though we both experienced the same weather and financial obligations etc... you are saying the likelihood is that with a million different choices at each rout that with in five hundred trips we would eventually both wind up at the same station, just by different routs?
Lets say getting of and on at a tain station is mutation. You also haveto include natural selection and lets say the proximity to station x is selected for.
So we both get up on a train if we get off on any platform that is further from platform x we are selected against so we start over at the last platform we have been on. Using this process we would both eventually arrive at the platform x