That's more like the end of the story...
Could be.
There are two camps when it comes to stuff like this. In one camp, there are those who believe that any suspect must be a perfect 100% match to the description put forth by Tina. And anyone who does not fit it exactly perfectly right should be instantly eliminated on the spot with no further question.
Then there are those who acknowledge how shoddy eyewitness testimony is and accept that Tina's description may not necessarily be gospel. Was Cooper male? Yes. Was he of middle age? Likely yes. Was he Caucasian? Likely yes, but there is also talk of him maybe being of Latin descent. Did he have dark eyes? It's better than 50/50 that yes he did. Was he somewhere closer to average height for a male? It's better than 50/50 that he likely was.
Was he for absolute 100% certainty either 5-10, 5-11 or 6-0 tall? I would argue no. There's probably a 95% chance that he was. Maybe 99%. But I don't think anything related to an eyewitness physical description can be 100%. Hell, there's even a case made for Barb Dayton.
As it relates to physical description, I think there's a difference between eliminating a suspect and making an argument against a suspect.
For example, I don't think the fact that Sheridan Peterson has blue eyes just flat out eliminates him as a suspect. It's definitely a strong argument against him, and it's probably the one thing that's holding me back with him. But I don't think an otherwise good suspect should be outright eliminated based on one minor discrepancy. I still think there's a strong chance Peterson could be the guy, despite the discrepancy with the eye color.
At the other end of that spectrum, if you presented me with a suspect who was a black female, we could safely eliminate that suspect as that's something that Tina could not possibly get so drastically wrong. Rackstraw lives toward this end of the spectrum. I think he's a great suspect, but the fact that he was only in his 20s at the time is hard to get past. Is he Cooper? I would say 99% no. Would I say 100% no? No, I would leave the door open a crack as I would with most any good suspect.
The height of Cooper has been discussed over and over. How accurately can you measure someone's height while they're sitting down? How close and for how long did Tina ever stand next to Cooper while they were both standing? (when she handed him the parachute manual; when he tried handing her a tip)
Is the fact that Turgeon was a few inches shorter than Cooper a strong argument against him? Absolutely. Should we completely stop investigating someone at the first red flag? I don't believe so. I believe you continue to investigate and see how many more red flags turn up. It may turn out that we find out a whole lot of compelling stuff about the guy and the one and only knock against him was that he was a few inches shorter than an eyewitness testimony about a guy who was sitting down. Or maybe we continue to investigate him and more red flags turn up and we decide "yeah it's not looking so good for this guy after all."
Or what if we find other records of him being listed at a different height and there ends up being a discrepancy between one record and another? What if his military records say 5-10, 170 and then we scratch our heads wondering where the missing person database got their info?
I guess my point is that we all have our threshold for when we decide to eliminate a suspect. For some of us, it's very early in the process and can come as a result of something very minor. For others, that elimination doesn't happen until further down the line after more information has been gathered and we have a bigger picture about the guy.
To play hypothetical, what if there was a murder and a witness described the killer as being 5-10. A suspect was reported, but he was only 5-6. Do the cops just automatically eliminate him and say "Nope, there's no possible way he's our man." Doubtful. While acknowledging that this suspect is shorter than what the witness testimony said, they will still likely kick that guy's tires a little to see what else they can learn about him.
I'm going to continue to kick the tires with this guy a little and learn more about him. If you'd like to eliminate him right now, you are more than free to do so. And you're not wrong for doing so.