NORMAN — Willie Warren has delivered several memorable performances in his short career at Oklahoma. When he does, he looks every bit the preseason All-American some tabbed him to be before his sophomore year. As a freshman, he scored over 30 points twice during nonconference play and over 25 points on a pair of other occasions in Big 12 play. Last season, without Blake Griffin for most of losses to Texas and Kansas, Warren showed potential to excel without the nation’s best player patrolling the paint. Warren’s done that in stretches this season, now that Griffin has made his permanent exit to the NBA. He’s scored at least 24 points in seven of 12 games, and in the season opener against Mount St. Mary’s, he passed out 11 assists to go with 15 points. What has kept Warren from making the transition from very good to great has been the poor performances slipped in between the fantastic ones. Warren didn’t take a 3-point shot against Arkansas, but in games against Mount St. Mary’s, Virginia Commonwealth, Centenary and Northern Colorado, Warren is a combined 0-of-20 from beyond the arc. On only one occasion, against Mount St. Mary’s, was his point total in double digits. Griffin and Warren’s games couldn’t be more different, but what made Griffin great, more than his freakish athleticism, imposing size, soft touch or rebounding intuition, was his consistency. Excluding the loss to Texas when he suffered a concussion, Griffin never scored in single digits as a sophomore in 34 games. In those games, he had single-digit rebound totals just four times, with a low of six. If Warren played poorly as a freshman, Oklahoma could still win with the national player of the year roaming the floor. Griffin is gone. Without him, Warren’s clunkers have been more glaring. Oklahoma doesn’t need Warren to score 40 points every time he steps on the floor. Having a consistent scorer is far from the Sooners’ only problem. But a consistent 20-plus, near his average, every night could help smooth out the Sooners’ rough start when conference play begins. When Warren scores in single digits, the Sooners are 2-1, with wins over Northern Colorado and Centenary. In the four games when he failed to convert a three, his team is 3-1. If he racks up more of those games against Big 12 teams, whether they come from the top or bottom half, that record will get worse.