Not that this means anything but has anyone noticed the 3 pics of the Skye Valadez person, specifically the middle one with the yellow vest, now zoom in on the right hand...black nail polish. Now look at the FBI pics of suspect, there is a clear one where he is walking down steps, concrete stairwell, now zoom in on the right hand...sort of looks like black nail polish to me.
Also everyone is perplexed by the suspects pic in the building stairwell where you can see the cell phone outline in his pants pocket and everyone is asking where is the rifle, how do you know that pic is from the day of the shooting? It could be from a different day. No time context was put on that photo it was just shared by law enforcement to get help finding the suspect.
Also on the pro vs lone wolf theory, like others, I think he missed, I don't think he intentionally aimed at the neck, also a pro would have had a better escape plane than jumping off a building. Complete guess on my part but wouldn't a pro opt for a lot longer shot, and silence the shot? That would make the escape easier, further away from the scene. I imagine a pro sniper could make a lot longer shot.