4. Brian Bosworth
Career Years: 1987-1989
Career Lowlight: Getting trucked by Bo Jackson on Monday Night Football.
When "The Boz" was drafted by the Seahawks in the supplemental round of the 1987 NFL Draft, he received the largest contract in team history and the largest rookie contract in NFL history. The Oklahoma Sooner standout was supposed to be a stud, and considering he is still the only player in NCAA history to win the Butkus Award for top linebacker in the nation multiple times, it's hard to argue the reasoning behind that lofty projection. However, a banishment for steroids in his final college game and subsequent abysmal NFL performance led this once-heralded player to fall completely out of the NFL by 1989.