SANTA CLARA, Calif. -- One of the way the San Francisco 49ers will adjust to losing versatile fullback Bruce Miller is by utilizing different offensive sets.They might do that by having more tight ends of the field or moving a tight end around. One candidate is first-year tight end Derek Carrier. He has played some snaps after being promoted from the practice squad last month.Carrier said Wednesday that he hasn't heard anything about his role in the offense without Miller.