Nessley - much more of an impact player.My vote to Marty. I don't know if there was a bigger fan favorite mop-up guy, at least in terms of a player whose potential and subsequent development diverged so greatly. Usually, when Marty N came in, that was the signal that the game was over for the opponent. But at rare times - starter foul trouble for instance - he had to fill in, and we cheered him on hard. A classmate of mine once remarked that he was a player that, when receiving the ball 3 feet from the basket, would generally not go strong to the rim for a dunk. Instead, he'd take one dribble, and, if it wasn't stolen, would shoot a fall-away short jumper (not often connecting). But we loved him - he almost never cost us games, b/c he seldom got in with the game on the line. Anything he could give us was icing on the cake.
IIRC Marty also had his career high (by a lot - about 25 pts) in Duke's all-time biggest blowout victory, a 76-pt margin vs. Harvard over winter break one year. Nessley Crunch, it was termed. But that was at Harvard, so the Crazies could not easily celebrate with him.
George - I think he was in my year, though in Engineering, and by all accounts he was super-nice and super-smart. But he seldom got off the pine.