Kaepernick focus may shift from knee to arm as start beckons

(Reuters) - San Francisco 49ers coach Chip Kelly acknowledged that Colin Kaepernick could be promoted to starting quarterback following the team's fourth straight loss on Thursday.  Behind another uninspiring performance from signal-caller Blaine Gabbert, the 49ers suffered a 33-21 defeat to the Arizona Cardinals and are faced with a dilemma over their struggling offense.The home San Francisco crowd chanted "We want Kaep" in support of backup Kaepernick in the late stages of the loss, forcing Ke