Without further ado, here's the San Francisco 49ers training camp opening-day mailbag:Jacob from Sacramento wants to know if I think first-round pick Jimmie Ward will win the starting nickel cornerback job.Bill Williamson: I do, yes. Ward was drafted to play the nickel right away and to be a starter at safety down the road. Unless he gets hurt or absolutely fails in learning the defense in camp, I see Ward playing a big role Week 1 at Dallas.Karl from San Jose wants to know if I think fifth-round pick Aaron Lynch will play much as a rookie.