With all due respect given, not certain I understand the significance of this.
From observing crime investigations over the years, it is IMO not uncommon for a defendant or relatives of e.g. the missing or accused to contact others and even news, media, or private investigators, etc. for assistance. With no intent to thread hop - by example - in the LISK / GILGO NY / NJ case of Rex Heuermann IIRC the Gilbert family contacted others in attempt to start and amplify the perceived stalled investigation. Some of that is in the ‘Lost Girls’ documentary.
Link on the Lost Girls documentary:
en.wikipedia.org
There are also several WS threads here on that continuing and expanding LISK investigation.
Last week I watched an episode on a long unsolved crime in which a family member had been murdered. IIRC a surviving relative went to the interesting approach to offer a reward and to publish notice of it in nearby jails and prisons. A fruitful lead developed, was pursued, and the cold case was solved. (Unfortunately the name of that case escapes me at the moment.)
I am not certain the lengths I personally might go to or enlist if a family member or friend was in need of similar assistance. But I envision they could be quite involved and expansive if necessary? MOO