From the perspective of making the final Olympic roster, Eric Gordon benefits the most from Wade's withdrawal.
Gordon has senior national team experience (he played on the 2010 FIBA World Cup Team), fresh legs after an injury-shortened season and a game that is markedly Wade-esque.
Gordon, like Westbrook and Harden, makes his money at the free-throw line. During 2010-11, his last reasonably healthy campaign, Gordon ranked eighth among guards in free throws per game.
And judging purely by aesthetic, Gordon might be the player that most resembles Wade. He is athletic, broad-shouldered and has a nose for the rim.
Westbrook is the better player—both on offense, on the glass and as a defensive menace—but if Westbrook steps into Wade's role, then Gordon seems like his most likely backup.
And as an added bonus, Gordon is a better marksman than Wade or Westbrook. He doesn't need the ball to get points and is able to spot up beyond the three-point line.
We should also note, with all the proper disclaimers about sample size, that Gordon largely outplayed Westbrook at the 2010 FIBA World Championships. He was a more efficient scorer and turned the ball over less during Team USA's nine-game run to the gold medal.