How does the Assignment assistant determine the route sequence suggested?

I would assume the Assignment Assistant should display the job being moved by the assignment assistant in the most optimal position on routes of the technicians, based on criteria similar to how the system determines the order of the technicians shown ranked from most optimal to least optimal options (i.e. lowest number of violations/warnings, most efficient option in terms of travel time and duration, etc). I have come across an example where that is not the case. In that example, the assignment assistant showed the job being moved as next on the route, which would cause the job after it