I've always figured the third was "Adam" who she later said the other players called Dan, or Dan Flannery, the team captain who lived at the house, and who booked the dancers. He could have been the one to put the press-on nails in the garbage or been the one to escort her to the car. And she would have remembered him because he was the one most likely to first greet her when she arrived. I think he's 23, wonder if he's graduating this weekend.
Dan Flannery is Kerry Sutton's client; she has been told he's not involved.