Iowa State just ended the season in last place. A promising playmaker won't be back to help turn things around.Monday, running back Deon Silas announced he is transferring. He would have been one of the team's top backs next year as a junior. His sophomore season was limited by injuries and playing behind Cartevious Norton and senior Jirehl Brock. When he played, he flashed a lot of talent.Silas had 60 attempts and averaged 4.5 yards per carry, scoring 3 TDs. The Memphis native thanked his coaches and teammates in a Twitter post before saying he was entering the portal.ISU finished the season 4-8, their worst season in six years.