I disagree with your assessment of your sleuthing skills. They are very good.If the luminol testing was "presumptive only" - and/or if it did not lead to additional testing that proved conclusive for the presence of blood in the carpet, then it seems unlikely that any person was ever wounded or killed (by firearm) while sitting inside the Durango. So, there may not be much to Klein's scenario where somebody "sneaks up beside the driver's side door in the school parking lot". Yet that is about the time that the phone was turned off...
Back to the .25 cal casing though. An absence of blood in the carpet would not necessarily mean that a .25 acp could not have been fired from inside the car toward a target outside. Maybe in a self defense situation, or some other kind of altercation? But if either of those scenarios did happen, who would've been involved?
There are just ZERO reasons that I can think of for the .25 cal casing to have been in TB's car. It drives me crazy!
Tom was not outdoorsy. Supposedly nobody in his family owned a .25 acp. I don't think the kind of kids he was hanging out with (in a town like Canadian) were the kind of kids that were typically packing heat when they cruised around town. I just think it's highly unlikely (though not impossible) that Tom could've had a .25 acp
Could the casing have been there from the car's previous owner (if it was purchased used)? Where was the casing found, on the floorboard, or in a hard-to-see/hard-to-find crevice under a seat? Was the casing dusted for prints and tested for DNA?
If the casing was (was) from a handgun that TB had somehow managed to obtain (possibly borrowed or purchased?), where/who would he have gotten it from? If TB had purchased a .25 acp from a local gun dealer, surely that info would've been made public by now (even if "registration" is not actually required to own a gun). If he bought a gun, maybe he did so at a local gun show? But you're back to why? if TB did somehow obtain a .25 acp, why would he have wanted or felt he needed to do so?
And almost nobody would buy a .25 acp - the equivalent of a pea shooter - for self defense; and even fewer I think would choose that sized weapon for self harm. Seems there'd be a risk / fear that you might somehow survive the wound. Again, I just don't think Tom had a .25 acp.
I assume the owner of Gun Barrel Sports (NL, I believe) would have had access to a .25 acp. Could one or two of TB's friends also have had indirect access to a .25 acp, either via gun dealer (SP), or a gun owned by a family member (MC)? There was more than one character in the story who was either in - or related to - somebody who was in the gun business
And is it true that JC used a .25 acp two weeks after Tom's remain were found? I read this in a March 7, 2019 article on KATP 101.9's thebullamarillo.com site. If so, that makes three possibly sources for a .25 acp handgun back in November 2016.
Or could the casing have been planted by somebody? If so, who might've had both a reason and opportunity to do that?
There are many clues, unanswered questions, and other facets of this case (besides the gun casing) that, if solved, could help us learn the truth about what happened to Tom that night: the 2015 encounter with then-Deputy Nathan Lewis outside the Palace Theater; the various sightings of the SUV that November night; and the timing, location, and condition of the three key items found over the next year and a half (after the Durango was found): the backpack, the cell phone, and Tom's remains.
Sorry nothing but a lot of questions. I guess that's an admission that I lack the required sleuthing skills to be able to answer many of my own questions.. It's a very frustrating case. I hope that eventually there is justice for Tom and his family.
Jmo
JC is in the teacher and Dad of M? Correct? That is VERY interesting about the gun he may or may not have been using 2 weeks after TB went missing.
If that is true we need to get that hammered down.