Today's US...Courtney gets a message that says "Where are you?" Her response was "This better be good." So, my scenario for now is: I think that Courtney could look very much like Nikki at night in a vehicle. I don't think Courtney hit Delia, but she could have just been with Zach trying to break up with him. Zach may not have been very accepting of Courtney's wanting to dump him. He may have been driving too fast trying to catch up with Courtney and didn't slow down for Delia. Also, no matter who hit Delia, it's possible they didn't see her, but given the extent of her injuries, I don't see how they couldn't have known they hit something.