Could a private investigation help this case?

Hello everyone who is interested in this case. So I have been following this case for years and have been fascinated with it. Its just a tragic case all around and I hope it will be solved one day. The inspiration for this post is my thought that maybe a private investigation by a company (or individual) could reveal more to the public and help it get solved (increase the exposure). There so little that is known to the public about this case (except the major details like potential the pizza hut encounter) and it got me thinking about another missing person case. The other missing person case is about a girl called Anthonette Cayedito that went missing in the 80s. Very little was known to the public for some 40 years untill a private investigator jumped on the case and revealed alot that was not previously known (like files and documents from the FBI that might indicate human trafficing). So my thought is, maybe something similiar could be happen if someone did the same thing? Like going through the police files, which I believe hold more to this story than what is known. Let me know what you think.