Unfortunately, you have some good and some bad with the media being quite different in the 80's. There was not as much coverage across the nation in the 80's; only some locals would have heard about Christopher's disappearance. This is a hinderance in the investigation.
However, on the upside, you did not have the national media looking at your family's every move and subjecting you to the intense scrutiny that happens now. Since LE focused on your mom early on, especially when she failed the LD test, the media would have also likely focused on your mom.
However, I do think that with media attention, LE may have been forced to "think outside the box" and consider additional suspects. Your mom would have also had additional help in "sleuthing" your main suspect. The media would have had a field day with this suspect's record. This may have pushed LE into looking deeper into her involvement.
It is hard to say if it would the difference would have been good or bad; but it certainly would have made a difference to have the internet and media attention on your brother's case many years ago.
My heart just hurts for your family. It is amazing that your mom has held on to hope for all of these years.
ETA:
My family wishes Christopher would have had National Media attention. We were so desperate to get his photo out and information about his disappearance. We did it the hard way with fliers. We sent packages of fliers to people across the United States, but really I look back and how sad that was, a flier of a missing baby posted up in a store! No National media attention. He got little bits here and there, but his story has never been told. It needs to be.
My Mom was under public scrutiny early on by the community (ask anyone from CS who lived there in 86), but my Parents have always had a good relationship with the local media. Yes, media is sometimes going to get reporting/facts wrong, but my Parents never had anything to hide, and they always spoke to media freely when asked because they knew they had to keep their sons disappearance out there.
The cold case detectives have the advantage of "time" in my brothers case. They know my parents have never wavered in the search for my brother. And they can see all of the work my Parents have done over the years.
My Parents have never given up on Christopher.
It would be very interesting to know the dynamics between these two; and what kind of personality her son has with the influence his mother must have on his life.
I agree.