I don´t see why a case could not be solved by an outsider especially if you had 10,000 people looking at it from all angles. Is it likely? Hard to say, but it is also difficult to rule it out completely. Of course we have no way of knowing if the perp/s have even been interviewed by the PJ or even mentioned in the files. Plus, when I say solved there is a big difference between seeing some contradiction or indications of possible guilt and actually gathering evidence against someone which would lead to a conviction. Of course if you look hard enough, which I imagine the PJ and OG did/ are doing you can come up with various people in the files who might merit a second look. But, calling that ´´solving´´ the crime would be a stretch. I have a feeling the perp probably has been interviewed formally or informally by the PJ but as I say this is a gut feeling about the case. The best ´´lead´´ we have is Smithman but what if this is just a red herring and one man bundled MM into a car he had parked nearby?. How do you resolve it without a confession or this man´s partner coming forward? There certainly were not many clues......................