The shooter is a trained military guy, maybe SAS or IRA, and will slip across the Canadian border and fly back to Europe from Toronto or Montreal.
The local team is expendable but has had almost two years to build escape routes and position cash and resources. My bet is that the truck is in a warehouse or garage in such a fahion that it won't draw attention for a least 5 or 10 days. The local team will easily move across both borders and be home in the Becca Valley or Saudi Arabia by next Monday. There are, of course, other teams in place trained and ready to use the weapons and material that comes so easily across the Mexican border.
I remember that. Do you also remember when the Palestinian sniper shot a baby in the head... or when the sniper shot the pregnant Israeli woman and her child in the car? It's the same type of killer that shot down the school boy. Palestinians, Al Qeada, Abu Sayef -- It doesn't matter which group -- they are all trained out of the same hate-filled, cold-blooded playbook. Come to think of it, why doesn't some expert come up with a profile of an Islamic terrorist for us.
You're turning this guy into some kind of super hit man. No way. this is probably a local (legal, illegal, or us citizen) who is not particularly extraordinary in any way. His marksmanship is not that wonderful, no matter what everyone tries to ascribe to him. He is really good at escape and evasion though, or maybe the police are really bad at detection and capture. I'm beginning to think it could be a cop of some sort. Someone who was bumped out and now has an attitude of "So you think you're so great? Well lets see how you handle this!" In any event, this is most definitely no super villan.
Apart from the rediculousness of linking the SAS and IRA, there is nothing special about Tarot Card Killer's marksmanship.
Anybody, with corrected eyesight and even the most rudimentary of motor skills, can reliably make accurate shots to 150 yards. Now, that is with iron sights. Add a scope, and 99.9% of the people could learn to shoot a .223 rifle that well in just few hours.
If this person were trained, or had a level of expertise in shooting, the shots would be at a minimum of 300 yards, and a lot closer to 500-600 yards.
Our local club has at least 15 people who can get 20 of 20 shots in an 8 inch group (or less) at 600 yards using iron sights. Those people are skilled, and many of them have only been shooting a few years. As far as I know, none of them are SAS, Rangers, Delta Force, Seals, Reconn, Airborne, and certainly not third world wannabe terrorists like the IRA.
On another note - there has been a lot of talk about the lack of shell casings - depending on the weapon involved casings are not a guaranteed leave - meaning he may have chosen or configured his weapon so that there is no automatic eject. Remember he is only using a single shot at a time so the auto-eject/reload function is not important. I find it easier to believe that it is a planned single shot exercise than I do the thought that he is taking the time to find and remove his casing each time. I think the one casing found so far was an intentional leave, not an accident or oversight.