I personally feel this was one person, not two working together with separate vehicles. I also think this was not an accident. I believe if she was bumped it was done on purpose or in pursuit of her. (the end justified the means). I think that if the bike was placed there the night of the abduction, they were in the middle of perpetrating the crime, it was in motion and that motion led them to that direction, meaning that Victim M was in the vehicle and headed to a future crime scene or holding area. If the bike was dumped after the crime, it was to separate themselves "cleanse themselves" of evidence after they were sure the bike was free from forensic evidence in the perps eyes. If M. is alive the bike was dumped either after she was secured at a location the perp felt safe keeping her or was in transit to said perp safe location.
I see many speculate on how could it happen so fast and with M fighting. We must remember M is a small woman and when a perp is in a frenzy they are very very strong.
Also that area where the bike was dumped depending on exact location it was found, I think there is a good chance the bike could sustain some damage from being dropped over the side. Hence leading Mom to believe perhaps an accident. I feel so bad for her.
I don't know about now, but I have been out on the interstate in that area in the wee hours of the morning. There is next to no traffic. Yes it has been many years ago but I remember just how lonely and desolate it seemed.
I can see how someone could stop and dump it (would take less than a minute to get out and throw it over) without being seen or heard. Looking for headlights coming from behind you can assure that no one is going to run up your butt, even with it having no side to pull over on.
I hope I am wrong, I just don't feel good about the outcome of this case. I am biased however since being once a victim and knowing once they have you, how slim the odds are of escape. I pray M. beats the odds, I really do... Prayers to her and her family...