Unknown Al Kite Killer - Colorado - 2004

I think the case itself can definitely fit into an hour- with the horrific details, angles to work with- is this a serial killer? was the killer inspired by the Usual Suspects movie etc....?

Believe me, I've taken everything you said into consideration, and like I said before, I've walked back on my stance that it was Keyes. But at the same time, I think I'm able to counter every point you raise.
You said the height is too big of a discrepancy, and while that's a good point, it's possible Keyes was altering his height. Some people are significantly shorter when they hunch, let alone walk with a limp and a cane. 
You also say the age of the suspect is a discrepancy. I'm not sure I agree. Keyes was known to be a man of many disguises. Witnesses were giving different ages for "Robert Cooper". Some had him in his 30s, while others had him in his 40s or 50s. There wasn't a definitive age, meaning this killer spent some time changing his appearance.
There's a lesser known ATM photo of the suspect (not the one everyone has seen), and the resemblance to Keyes is STRIKING. I tried to post it on here, but the file was too big.
Your point about Keyes' DNA is probably the only convincing thing that would make me think he wasn't the killer. I would have to agree that they probably tested Keyes' DNA to see if there was a match. But at the same time, do we know if they actually did that? Maybe they never took Keyes seriously as a suspect. When I was emailing the detective last year, I got the impression that they didn't take Keyes seriously as a suspect. 

My apologies it was a recent but not the most recent episode of The DNA of Murder with Paul Holes. I finally watched the episode via On Demand.

The most significant update is there was a tiny blood droplet on a step which has lead to genealogy results identifying relatives of "Robert Cooper" in the Balkan (Southern European) region.

The show confirmed some of our theories such as this being a thrill kill but apparently that slight Romanian accent some of us suspected was fake nay possibly be real based on the DNA results (even Paul Holes thought it was a ploy at first).

Paul Holes interviewed a few experts on the show and one thing he was very interested in was the unique methods in which Kitenwas tortured and bound, which to him he had never seen before in the level of precision and basically it looked like Cooper was an expert.

This lead to a solid theory from one expert that Cooper may be associated with Turkish Hezbollah. This isn't the traditonal Hezbollah terrorist organization that are anti-Israel that we think of. Hezbollah simply means "Party of God", and my short-term memory is failing me but Wikipedia describes them as a Kurdish Sunni Islamist militant organization, active against the Kurdistan Workers' Party and the Government of Turkey.

According to the expert, the torture methods used are eerily similar to the way Turkish Hezbollah would torture Kurdish rebels.

However, the main thing is after 15 years, we've finally had a major break in the case as far the genealogy database matching to relatives of Al Kite's suspected killer.

The good news is the US has an extradition treaty with nearly every European country, and also, we do have one with Turkey.

If they ID the killer, and he is in a foreign country, I am sure that the death penalty may come off the table, as many countries won’t extradite if someone is facing the hot needle.

While the 7/11 angle is a good point, but the Turkish Hezbollah angle was a theory developed on the show. The killer was methodical and smart but I doubt even he had the foresight to go "let me torture this guy in a way Turkish Hezbollah did and make them think it's them" (and would still have to be from around or near the region to have some knowledge of it since there was Google back then but the advanced resources are even more massive now), especially since the theory wasn't developed until 15 years later.

The only problem with the Turkish Hezbollah theory is it could possibly be a theory and the expert on the show can be wrong about where the killer's torture methods came from, perhaps it was some sort of similar group, but I really doubt this was a ploy and it's giving the killer- who is admittedly smart- a little too much credit and making him out to be a super genius when he was at least not smart enough to leave some DNA. (and also show himself on surveillance).

But yeah I wanted to be polite about Israel Keyes but it looks like we can officially say it's not him lol. In fairness, while I'm usually skeptical whenever Keyes' name is brought up in a cold case, I felt this was one of the better cases to wonder about so it wasn't that much of a reach on your part.