Colin Kaepernick is the only 49er to lose his starting spot this season, but it appears the QB soon could have company.

On Sunday, right guard Jordan Devey made his ninth straight start, but he played just nine snaps in the 17-16 win over the Falcons. Andrew Tiller, who had been splitting snaps with Devey, came off the bench for 48 plays.

In the previous four games, Tiller had played 128 of 250 snaps. Head coach Jim Tomsula didn’t announce who would start at right guard Nov. 22 at Seattle.

“Tiller did a pretty good job, still needs to improve,” Tomsula said. “We need to improve. We’re going to keep working through that.”

Tiller, who was promoted from the practice squad in October, is known for his run-blocking ability. On Sunday, the 49ers had 133 rushing yards, their highest total since Week 1’s victory over Minnesota.

They did so despite having a three-man backfield comprised of players who had joined the 53-man roster eight or fewer days before kickoff. Shaun Draughn, who had a team-high 58 rushing yards, was signed six days before the game.

The 49ers had averaged 83 rushing yards over their previous five games.

“We wanted to commit to (the run game), and we stuck with it,” Tomsula said. “There was obviously some tough treading in there in a couple of spots, but we stayed with it and wanted to play complementary football. We wanted to be balanced on offense.”

No time for Carradine: Defensive tackle Tank Carradine didn’t play a snap Sunday and was the only member of the 46-man active roster who didn’t play.

Carradine, the No. 40 pick in 2013, has one sack this season and has played more than 19 snaps in two of nine games. He played just nine snaps, his second-lowest total of the season, in a 27-6 loss at St. Louis on Nov. 1.

Tomsula said the 49ers are asking Carradine to adopt a different role.

“That wasn’t a knock on Tank not playing,” Tomsula said. “It’s just kind of where we are coaching-wise now. You know, trying to switch gears a little bit with Tank and utilizing him to his strengths.”

Tomsula, the 49ers’ defensive line coach from 2007 through ’14, said he approached the defensive staff about tweaking Carradine’s role.

“That is an area that I got involved in, just in terms of Tank, because I coached him,” Tomsula said. “Excited about it.”

Briefly: Much of team will break for the bye week Tuesday, but younger players will stay for a practice session Wednesday. … Outside linebacker Aaron Lynch sustained an ankle injury and dislocated finger Sunday, but neither injury is considered serious. … Cornerback Jimmie Ward sustained an ankle injury in the first quarter, but he had it taped and didn’t leave the game.

Eric Branch is a San Francisco Chronicle staff writer.