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I doubt the suspect(s) are young thrill-killers. They got their thrill Wed night and to continue the spree 12 hours later (after having the time to reflect on what they'd done) might indicate someone with a more resolute and sinister motive. They started pretty early Thurs morning which might indicate that the shooter had no trouble sleeping (also could indicate that the shooter DID NOT sleep) I would expect young, thrill-killers to stay up late celebrating their adventure and, of course, they could have decided that it was worth continuing as soon as targets were available the next morning. We should consider why the shooting stopped at 10 AM Thurs. morning. Was it getting too risky to carry out the shootings? out of ammo? Lack of targets or was the "operation" complete?
Answers to these questions might help to establish motive. Obviously, at this point and with the little information we have, we can only speclate.....as I have done.

I was wondering, too, if one of the murders was done to kill a specific victim, and the others might have been done to try to obscure the motive.

FWIW.A FReeper on another thread said he had seen a theory that the shooting locations on a map could be construed as an arrow pointing to DC.