The Chargers released Neal in the hopes that Andrew Pinnock would be a more than adequate replacement. They also feel their second-round pick, Jacob Hester, can take over for Turner, a free agent, who was signed by the Atlanta Falcons.
From everything I have read, it is looking like Pinnock will be taking over regular fullback duties, with Hester supposedly lining up at halfback, fullback, and as a slot receiver. In the even that Tomlinson went down, I would say San Diego would be in a full-fledged RBBC. Hester would be the pounder, Sproles would be in on 3rd downs and passing plays, and Thomas would also see some touches.