As a freshman in 2021, Marion started all 12 games for the Huskies and totaled 28 receptions for 474 yards and five touchdowns.[3] In 2022, he appeared in just five games after suffering a broken collarbone, finishing the year with four receptions for 89 yards and a touchdown.[4] After the season, Marion entered his name into the NCAA transfer portal.[5]
BYU
Marion transferred to play for the BYU Cougars.[6] In his first season with the Cougars in 2023, he notched 20 receptions for 216 yards, while also adding three rushing touchdowns and 19 kick returns for 393 yards.[7] In week 3 of the 2024 season, Marion returned a kickoff 100 yards for a touchdown in a win over Wyoming.[8] In week 11, he returned a kickoff 96 yards for a touchdown versus in-state rivals Utah.[9] For his performance on the season, Marion was named second-team all-Big 12 Conference and first-team all-American.[10]