Excellent points, and got me thinking about the Va Tech connection.
On October 17, 2009, #4 Va Tech played an away football game, against lower ranked Georgia Tech, which they lost 28-23. It was a night game.
Very close by to JPJ Arena is a wings place/sports bar, in Barracks Road shopping center. My thought...if the game had ended by 9:30 and the person who picked up Morgan was leaving that place, heading to parts west or south, going the "back way" to avoid Emmet street would put him (or her or they) on Arlington, Massey, and Copeley, where he would have passed a hitchhiking Morgan on the bridge (but on the side of the road without the sidewalk if following the route I'm suggesting) or at the Copeley/Ivy intersection if she made it that far (but again, in the right hand lane, with her across the street).
If he was decked out in Tech regalia (and possibly across the street, so no immediate physical threat), and maybe driving a nice car or truck (or motorcycle, for that matter), Morgan may have let her guard down.
"Did you hear about the game?" "No, what happened?" "We lost, 28-23...hey, you need a ride? Where you going?" "Roanoke (or wherever)" "Me, too..."
Or, if the game wasn't over by then, he may have invited her to go catch the end of it and wait for her friends.
This seems plausible to me, but there are a lot of people who wear Tech gear around C'ville, so it still doesn't give a sense of who it was, but maybe asking the patrons of the wings place to think about this one more time...