Koback attended Kentucky in 2017, but did not play in any games.[5] In 2018, he transferred to the University of Toledo.[6][7] In his first year at Toledo in 2018, he led the team with 917 rushing yards on 153 carries with 14 touchdowns.[8] In 2019, Koback rushed for 1,187 yards on 195 carries with 12 touchdowns. In 2020, he had 522 yards on 123 carries with four touchdowns and in 2021, he had 1,407 yards on 208 carries with 15 touchdowns.[9] At the end of his college career, he played in the 2022 Hula Bowl, where he was named the offensive MVP of his team.[10]
On May 10, 2023, Koback signed with the Seattle Seahawks.[15] He was waived on August 23, 2023 and later re-signed to the practice squad, but released shortly after.[16][17]
Philadelphia Eagles
On September 20, 2023, Koback was signed to the Philadelphia Eagles practice squad.[18] On October 16, 2023 he was released from the practice squad.[19]
Seattle Seahawks (second stint)
The Seahawks signed Bryant to their practice squad on October 24, 2023.[20] He signed a reserve/future contract on January 8, 2024.[21] However, Koback retired from professional football on April 9.[22]