By Jenni CarlsonColumnistjcarlson@oklahoman.comWatching his teammates dribble out the final seconds of the game, De’Vion Harmon waved his arms, then clapped his hands and belted out a celebratory whoop.There was lots to celebrate.OU 75, Kansas 68.On a day the Sooners scored a signature win, a boost to their NCAA Tournament resume and a confidence builder at the beginning of a brutal four-game stretch, Harmon was huge.Read more on NewsOK.com