OTOH, If this is a serial, he sure feels comfortable working outside of his comfort zone (VA shootings). This points to possibility of a 2nd perp possibly centered in Spotsylvania/Fredricksburg area. Nature of shootings also points toward sniper and spotter/driver pair. If these were a couple of Klebolds on the rampage someone would have bragged to a woman or the guys at the range about it by now.
Finally, just about any serial killer has some kind of issues and this should influence the target choice: couples on dates, prostitutes, gays, or a racial type. May not be AQ but so far this is very professional.