Former Green Bay Packers RB Kregg Lumpkin was one of the last cuts before the start of the 2010 season. He was claimed off waivers by the Buccaneers, but rarely played, and only recorded 1 rushing attempt and 1 pass reception in 2010. He wasn't much of a loss because he hadn't been anything great during the previous two preseasons, and he's had trouble staying healthy.
Tampa Bay has fortified the running back position with the drafting of sixth-round pick Allen Bradford. The Bucs also like seldom-used backup Kregg Lumpkin. The Buccaneers have some depth with their third-down back as well with Graham being more than capable of handling those duties, and he is under contract for 2011. Williams also does not play on special teams, and backup running backs have typically been core special teams contributors for Tampa Bay.
I'm glad to see Lumpkin has been able to keep his NFL career going. The Pewter Report also said that Williams is a good team leader and likely to return for cheap (he's about to turn 30 and has had a couple seasons wiped out due to injuries). I'm all for keeping a talented young player over an aging veteran, but Lumpkin never showed that much talent. They might be better off keeping the team leader in this case.