Colin Kaepernick and the San Francisco 49ers deserve applause for executing an in-season quarterback change expertly in 2012.The coaching staff tailored its offense to Kaepernick's strengths. Kaepernick responded by playing a leading role in the team's 7-3 record to close the season, counting playoffs and Super Bowl. He was sometimes the best player on the field, even in games featuring top quarterbacks such as Aaron Rodgers.2012 Total QBR Leaders, Weeks 11-21In fact, Kaepernick finished that 10-start period (Weeks 11-21, including a playoff bye for the 49ers) with the NFL's second-best Total QBR score (81.