Statistically, Colin Kaepernick hasn't been all that impressive in 2013.He ranks 20th among NFL passers this season, having thrown for 1,584 yards, more than 1,000 yards less then Denver's Peyton Manning or Detroit's Matthew Stafford. And his completion percentage of 57.1 percent is just 27th in the league – near the bottom, in other words. Meanwhile, his quarterback rating is 87.6, far below the 98.3 he posted last season, when he took over the job from Alex Smith and put up big numbers en route to helping San Francisco reach the Super Bowl.Yet Kaepernick has led the 49ers to five straight victories and the 49ers have scored 30 or more points in each of the wins. And, on a far different rating system – ESPN's QBR formula – Kaepernick ranks as the No. 3 quarterback in the NFL.The QBR formula, which ranks players on a scale from zero to 100 for every game, with 50 being average, has Kaepernick with a season average of 75.2 in 2013, behind only the 84.2 of Manning and the 77.4 of the Chargers' Philip Rivers.And, over the past two games in victories over the Titans and Jaguars, he's posted scores of 99.0 and 99.8. The 99.8 rating was the highest for a quarterback in...