15. Ricky Williams:
Williams came into the NFL amongst much hoopla when Mike Ditka and the New Orleans Saints traded their entire draft in 2000 to select the Texas running back. Williams wasn’t necessarily a bust despite the huge amount of hype heaped upon his shoulders. He became a solid (if not elite) running back in the NFL. His finest season came in 2002 when he led the league in rushing as a member of the Miami Dolphins. That season, he made First-team All-Pro, the Pro Bowl, and even won the Pro Bowl MVP.
Williams ran into trouble after failing multiple drug tests for his drug of choice, marijuana. Facing a suspension prior to the 2004 season, Williams announced his intention to retire from pro football. He became a student of ancient Indian holistic medicine during his time off. Williams returned to the Dolphins before the 2005 season, serving his suspension and paying the team a percentage of his signing bonus. But Williams then violated the NFL substance-abuse policy yet again and was suspended for the entire 2006 season.
He returned in 2007 after agreeing to multiple drug tests a week. He would miss most of the season after tearing a pectoral muscle in the first game. Williams actually had a strong season in 2009, rushing for 1,121 yards in his best season since 2003. His career was a strange one due to his multiple drug issues and early retirement. Overall, he was a solid player. Fans just can’t help but wonder if he could have accomplished more if he was more focused on football.