I think there are too many circumstances pointing away from a planned abduction by someone close to ER or MR in any way, mostly the idea of finding Dylan alone.
If anything, I would more suspect a perverted neighbor who just happened to see MR leave and knew Dylan had come to visit. This type of person could have, I guess, coaxed Dylan into accepting a ride, and this person could have been back home or wherever he was supposed to be within an hour or two, so that no one noticed him missing. If this happened, Dylan is not alive. And maybe LE even interviewed this person, but if he had never been accused or charged with anything before, they would have no reason to pursue him. Maybe he even allowed a search of his home, since he knew Dylan had never been inside.
I would believe this type of scenario before some idea of a plot to take Dylan away from his warring parents, or one of his parents arranging to "hide" him for no reason I can imagine.
But then we still have to believe that his phone conveniently died before he was taken by the unknown neighboring pervert who just happened to be looking out the window at all of the right times.