San Francisco 49ers quarterback Colin Kaepernick (7) runs against the Dallas Cowboys during the first half of an NFL preseason football game in Santa Clara, Calif., Sunday, Aug. 23, 2015. (AP Photo/Tony Avelar)

San Francisco 49ers running back Carlos Hyde (28) carries in front of Dallas Cowboys linebacker Kyle Wilber (51) during the first half of an NFL preseason football game in Santa Clara, Calif., Sunday, Aug. 23, 2015. (AP Photo/Ben Margot)

Dallas Cowboys quarterback Tony Romo (9) passes as San Francisco 49ers linebacker Ahmad Brooks (55) applies pressure during the first half of an NFL preseason football game in Santa Clara, Calif., Sunday, Aug. 23, 2015. (AP Photo/Ben Margot)

Dallas Cowboys quarterback Tony Romo (9) hands off to running back Darren McFadden (20) during the first half of an NFL preseason football game against the San Francisco 49ers in Santa Clara, Calif., Sunday, Aug. 23, 2015. (AP Photo/Tony Avelar)

Dallas Cowboys running back Joseph Randle (21) carries against the San Francisco 49ers during the first half of an NFL preseason football game in Santa Clara, Calif., Sunday, Aug. 23, 2015. (AP Photo/Tony Avelar)

San Francisco 49ers nose tackle Mike Purcell (64) returns an interception for a touchdown against the Dallas Cowboys during the first half of an NFL preseason football game in Santa Clara, Calif., Sunday, Aug. 23, 2015. (AP Photo/Tony Avelar)

San Francisco 49ers running back Carlos Hyde (28) stiff arms Dallas Cowboys linebacker Kyle Wilber (51) during the first half of an NFL preseason football game in Santa Clara, Calif., Sunday, Aug. 23, 2015. (AP Photo/Tony Avelar)

San Francisco 49ers running back Mike Davis (20) carries against the Dallas Cowboys during the first half of an NFL preseason football game in Santa Clara, Calif., Sunday, Aug. 23, 2015. (AP Photo/Tony Avelar)

San Francisco 49ers defensive end Quinton Dial (92) celebrates during the first half of an NFL preseason football game against the Dallas Cowboys in Santa Clara, Calif., Sunday, Aug. 23, 2015. (AP Photo/Tony Avelar)

San Francisco 49ers nose tackle Mike Purcell (64) runs past Dallas Cowboys offensive guard Mackenzy Bernadeau (73) as he returns an interception for a touchdown during the first half of an NFL preseason football game in Santa Clara, Calif., Sunday, Aug. 23, 2015. (AP Photo/Tony Avelar)

Dallas Cowboys coach Jason Garrett applauds during the first half of an NFL preseason football game against the San Francisco 49ers in Santa Clara, Calif., Sunday, Aug. 23, 2015. (AP Photo/Tony Avelar)

San Francisco 49ers nose tackle Mike Purcell (64) celebrates after returning an interception for a touchdown against the Dallas Cowboys during the first half of an NFL preseason football game in Santa Clara, Calif., Sunday, Aug. 23, 2015. (AP Photo/Ben Margot)

Dallas Cowboys quarterback Tony Romo talks with coach Jason Garrett during the first half of an NFL preseason football game against the San Francisco 49ers in Santa Clara, Calif., Sunday, Aug. 23, 2015. (AP Photo/Tony Avelar)

San Francisco 49ers quarterback Blaine Gabbert, left, scrambles against Dallas Cowboys defensive end Randy Gregory (94) during the first half of an NFL preseason football game in Santa Clara, Calif., Sunday, Aug. 23, 2015. (AP Photo/Tony Avelar)

San Francisco 49ers running back Jarryd Hayne (38) is tackled by Dallas Cowboys defensive tackle Ken Bishop (66) during the second half of an NFL preseason football game in Santa Clara, Calif., Sunday, Aug. 23, 2015. (AP Photo/Tony Avelar)

San Francisco 49ers wide receiver Quinton Patton (11) celebrates with fans after scoring a touchdown following a blocked punt during the second half of an NFL preseason football game against the Dallas Cowboys in Santa Clara, Calif., Sunday, Aug. 23, 2015. (AP Photo/Ben Margot)

Dallas Cowboys quarterback Dustin Vaughan (10) is tackled by San Francisco 49ers linebacker Desmond Bishop (51) during the second half of an NFL preseason football game in Santa Clara, Calif., Sunday, Aug. 23, 2015. (AP Photo/Ben Margot)

Dallas Cowboys wide receiver Nick Harwell (17) celebrates with wide receiver Antwan Goodley after a touchdown reception against the San Francisco 49ers during the second half of an NFL preseason football game in Santa Clara, Calif., Sunday, Aug. 23, 2015. (AP Photo/Tony Avelar)

Dallas Cowboys quarterback Jameill Showers (7) scrambles from San Francisco 49ers defensive tackle Garrison Smith (65) during the second half of an NFL preseason football game in Santa Clara, Calif., Sunday, Aug. 23, 2015. (AP Photo/Tony Avelar)

Dallas Cowboys wide receiver Dez Bryant gestures to fans during the second half of an NFL preseason football game against the San Francisco 49ers in Santa Clara, Calif., Sunday, Aug. 23, 2015. (AP Photo/Tony Avelar)

Dallas Cowboys quarterback Tony Romo, left, greets San Francisco 49ers quarterback Colin Kaepernick after an NFL preseason football game in Santa Clara, Calif., Sunday, Aug. 23, 2015. (AP Photo/Ben Margot)

In this photo taken with a fisheye lens, San Francisco 49ers coach Jim Tomsula, left, greets Dallas Cowboys coach Jason Garrett after an NFL preseason football game in Santa Clara, Calif., Sunday, Aug. 23, 2015. The 49ers won 23-6. (AP Photo/Tony Avelar)