So many questions.... Did the kid scope out the area days before and happen to discover a 20 foot ladder? How did the gun get there, surely he didn't carry it in, it had to be stashed. If stashed, was it so well hidden that nobody could stumble across it... (or going conspiracy, was it put out for him at the last minutes with an inside job).
Was the area open to "visitors" days before the event... ? Did the kid have a VPN to obscure searches, I do, because it ain't nobody's business what I search for (MEGA Chocolate Pudding recipes, in case the FBI/CIA are interested)...
Sloped roofs my butt, it couldn't of been that steep, steep enough to shed rainwater at best... If the FBI wanted to make an excuse they could of cited the ability to hold weight of a full cad sniper as an excuse and of been more believable.
Lastly, the kid that had no record had his DNA in FBI databases... Hummm.... He had no ID on him, so did they get ID from his car or some DNA Heritage test his folks took?