NORMAN — Based on his performance throughout spring ball, Mackenzie Alleyne is shaping up to be an exceptional under-the-radar pickup for the Sooners. Alleyne is a redshirt sophomore wide receiver who transferred to Oklahoma from Washington State in January. He is one of three wide receivers who signed with OU from the transfer portal, along with Trell Harris and Parker Livingstone . Alleyne is a former walk-on, and he was unranked in the transfer portal after his second season at WSU. But his quiet addition to the roster is seemingly already paying off for the Sooners. “He's had an awesome spring,” OU offensive coordinator Ben Arbuckle said. “He's a fierce competitor.” Alleyne overlapped with Arbuckle and quarterback John Mateer for one season in Pullman, as both of them came to OU from Washington State after the 2024 season. The receiver redshirted that year and did not appear in any games. In 2025, Alleyne became a regular contributor for the Cougars and played in all 13 of their games.…