By Andrew Gould Fans packed Memorial Stadium to witness Oklahoma’s annual spring game on Saturday. The Sooners reported 75,360 people at the exhibition, marking the nation’s highest spring game attendance this year. Saturday’s showcase delivered the unofficial team debut of quarterback Dillon Gabriel, who got his first exposure to his new school’s passionate fan base. The UCF transfer responded to the full house with a famous rallying cry before sending another message of gratitude on Twitter. “Sooner Nation is one of a kind!” Gabriel posted on Saturday night. “The whole team is blessed to hav…