NORMAN — In March, true freshman wide receiver Jahsiear Rogers said that there wasn’t much of an adjustment when he enrolled at Oklahoma in January. “It really hasn’t been a big transition,” Rogers said at OU’s spring media day on March 9. “It’s more so being on top of everything and more football involved.” When Rogers said that, spring ball hadn’t yet begun, and the Sooners had recently completed their winter workouts. And when he got the chance to showcase his talents in front of fans at Gaylord Family-Oklahoma Memorial Stadium, Rogers proved that he wasn’t lying. Rogers finished the spring game on April 18 with five catches for 70 yards.  His reception and yardage totals led the “White” team, which consisted of mainly backups and lost 31-3 to the “Red” squad. Rogers’ notable performance in the intrasquad exhibition was likely no surprise to OU coach Brent Venables , who praised the wideout’s talent on Early Signing Day in December. “Fantastic player,” Venables said.…