If god forbid any of my loved ones were victims of a crime and I had someone in my life who was comfortable speaking in public and to the media, you can bet I would ask them to be my spokesperson. If they knew and loved my person, even better.
Some here and in the media may be 'repeating what he says like gospel' because we spend page after page rehashing and overanalyzing everything or in the media's case reporting the same thing because it is all we have to 'work' with, but the great thing is that authorities, who are actually working the case, have ongoing access to all of the important people and information and can ask, confirm, solidify, and that is what matters. I haven't heard anything from LE that would hint at the family being uncooperative or misleading or anything nefarious whatsoever.
I get that we have questions but I also can't help but feel like maybe this is why family members don't speak publicly. Their worlds have been destroyed and they are willing and eager to talk about their loved one and try to remember what happened through their trauma ridden brains with hopes of keeping the story front and center so progress happens on the case and meanwhile message boards will question you until what you have said can be dissected to satisfaction.
That is just how I feel.