It sounds like you have some law enforcement experience, as well as experience in the court system. You are probably more familiar than most with the latest trends in solving cold case, missing person cases. This is an exciting time, as in the past couple years, many cases that were considered almost "unsolvable" are being solved because of DNA testing and "websleuthing" via websites like NAMUS. I very much doubt these trends are going to spill over into this case anytime soon, but hopefully, 10 or 20 years from now, DNA tests on all viable suspects will tell us at the least, who the Cooper suspect wasn't.
Yes, it's a good time to be in law enforcement, that's for sure. Now, if we can just get cops to all wear bodycams, it'll be great!
The only downfall with advances in criminal science it is harder and harder to get a conviction on someone because of what we call "the CSI effect". Jury members sometimes will just refuse to convict if there isn't DNA. Some cases were so obvious (no alibi, clear motive, a dozen eye witnesses) that we didn't even attempt to send off potential DNA evidence to the crimelab and it came back to bite us because one or two people on the jury (must be unanimous decision in criminal cases) won't convict unless there is DNA. It's silly. Nevertheless, on the whole, it is a WONDERFUL thing, especially as applied by groups like the Innocence Project, etc., because often times you are freeing an innocent man while at the same time catching the bad guy.
Concerning DB, I think there needs to be more of a focus on missing persons from that time period like Lepsy or Wilson, because there is obviously a very good chance that DB fell to his death.
About Lepsy specifically, I keep going back to his eyes. Those lazy eyelids are a definite feature. Also, I just did a blind test with my wife with that picture of DB at the wedding and she would have guessed early 40's. She was quite surprised when I said 33.
Another thing about Lepsy: Did he have any criminal background at all? I guess disappearing in the first place is suspicious behavior (assuming he wasn't kidnapped).
Something else: The sketch that was released in the 80's by Flo has the hijacker with a widow's peak. That is something that Comp's A&B do not have. In a few of the pics of Lepsy where his head is facing down you can see a bit of a widow's peak with his hairline. Just a thought.