SANTA CLARA, Calif. -- Last season, A.J. Jenkins failed to give the San Francisco 49ers' offense a spark. Nine games into this season, the player the 49ers traded Jenkins for isn't doing much better.Despite getting chances to help at a position that badly needed it, Jon Baldwin has given the 49ers' offense little. With Mario Manningham back on the field and Michael Crabtree on pace to return soon, it doesn't seem like Baldwin's chances will increase.