Unfortunately I think many cases that remain unsolved over the years follow the same pattern. Cases that are not solved within the first few months seldom are. And those that you hear about today that have been solved after 20, 30, 40 years even, the vast majority were not solved because the police caught up to the suspect, but because technology caught up to the suspect.
Sometimes in a case you can have too much information that it is hard to know what information to follow. I submitted a description tip as I am sure probably thousands of other people have submitted description tips based on either Liberty German's video, sketch #1, or sketch #2. Who is correct? Are the police correct about their sketches or is there a tip that correctly identifies the man on the bridge in Liberty German's video? We simply do not know.
Yes, this case is probably going to need a lucky break if it gets solved soon without having to wait for years. If this case is ever solved, I think that person is probably going to look nothing like either sketch, but will probably be closer in age to the older one. And they will probably only have a loose connection to Delphi, IN whether they were traveling through the area or visiting.