I think they need to start over with the investigation. Begin at MR's house and canvass the area with the dogs. I also would like to know more specifics on why they ruled out the postal worker sighting.
I feel like things have been terribly derailed by the drama between the parents and the divorce issues. Their issues are not uncommon from many other couples. Many couples have bad stories to tell about what happened in their marriage or in divorce and many are unable to communicate well. Who is hurt the most by this, the children. Parents just don't typically print their issues in the paper or on SM sites.
We see cases on here of children that seem to vanish in thin air all the time. There are always unexplainable things that don't make sense or add up. Then later, we find out it was a abduction or accident that had nothing to do with the parents at all. Although extensive searches are done, a lot of times the child is found later, near where they searched by someone out walking and it is usually near where the child disappeared from.
Maybe MR doesn't want to play the FB game or the Dr. Phil game, which is exactly what I think it is. Maybe he doesn't want to get into a texting argument so only what he says out of who knows how many texts gets posted on FB, again another game that has caused further isolation. I think there have been outside influences that have encouraged this game to continue and progress and it has caused harm that may not be able to be repaired.
Therefore, the parents can both still work towards the goal of finding Dylan but I don't think that they will be able to get past the anger and stand side by side in doing so and I don't see how it would make any difference if they worked separately or together.