49ers backup QB Colt McCoy turned in a "solid" spring and is locked in as Colin Kaepernick's top clipboard holder. It's a depth chart to keep in mind in case dual-threat Kaepernick suffers an injury. Beat writer Matt Barrows suggests Jim Harbaugh would run an "Alex Smith-like" offense if McCoy were pressed into action. McCoy and Smith are similar players; extremely limited arm talents with some mobility and "moxie."