There's no question the 49ers' Colin Kaepernick is one of the NFL's most exciting young quarterbacks, up there with the Colts' Andrew Luck, the Redskins' Robert Griffin III and the Seahawks' Russell Wilson.San Francisco 49ers quarterback Colin Kaepernick (7) throws during practice at the team's NFL football training facility in Santa Clara, Calif., Wednesday, June 12, 2013.