Lots of food for thought in there.
I have an interest in concealing long guns as my state isn't open carry and I don't want the neighbors being concerned when they see me and my tacticool gear wandering off into the woods. I hike down the trail a ways, then assemble whatever I have that day.
I have several single-shot rifles and shotguns that break down fairly easily. For that sort of thing, you only need remove a single screw/pin. I only have three that will completely fit in a backpack, even my gigantic CamelBak, and two of those are a literal stretch. A 30.06 Mauser does not break down into a small package. Still pretty bulky.
The claim of a 30.06 round doing so little damage is not compelling. Those rounds are monsters compared to typical AR-15 rounds. When he said there was no exit wound, I scoffed at first. Hitting a ballistic dummy in the skull isn't as convincing as replicating the test vs. the neck. But I think he's right. Wouldn't blood have sprayed out the back? And even if you don't hit bone, the shockwave from such a caliber in soft tissue would be stunning. I'm not so sure that wouldn't not have all but decapitated him.
Think he has an error in the timeline. Did the FBI claim the shooter changed clothes after taking the shot, or after escaping? Also, even if someone on the street noticed his huge rifle poking out his bag, Utah is an open carry state and I didn't see anyone on the street reacting as if they knew there a shooting had occurred. No idea how common an unconcealed rifle is, but I would assume it's a bit strange. Anyone?
Two other things; I don't see the kid's family screaming that he didn't do it. And the trans lover? Well, Charlie's trans hate would make a good motive, but trans people are so rare it's a little too pat that his lover happened to be one.
I've been wrong on more than one aspect of this thing, so take all that as you will.