UCLA running backs coach Steve Broussard has more to consider this week.
Broussard is already rotating three running backs — Jordon James, Paul Perkins and Steven Manfro.
"It's all about feel during the game," Broussard said.
James has done the bulk of the work. He is fifth nationally, averaging 141.3 yards per game. But Broussard has kept him fresh with Perkins and Manfro, each averaging more than six yards per carry.
Perkins has 110 yards in 15 carries; Manfro has 56 in nine. Both, like James, are skilled receivers.
Now add Thigpen, who was the Bruins' third-leading rusher last season with 262 yards and caught 18 passes for 211 yards.
"J.J. is the starter. He has had three good games," Broussard said. But "as the game goes on, I start to get a feel for how guys are playing. You're looking for consistency."
Waiting in the wings is easy, Manfro said.
"You stand there and be ready," Manfro said. "You can't stand there and pout, have a long face and be sad. You have to be prepared for when they call your name."
Staying fresh is easier for Manfro as he is the team's kickoff returner.
"I can be out there on the first play of the game," he said. "I can get my mind right, prepare for the long battle ahead."
Coach Jim Mora charged up the significance meter Tuesday, as the Bruins head into their Pac-12 opener.
"We're entering the jungle," Mora said. "You can't have a slip-up."
The No. 12 Bruins (3-0) have won only one of their last five conference openers, and that was on the road at Oregon State in 2011. UCLA lost to Oregon State in the Rose Bowl to open conference play in 2012.
Every team in the Pac-12 South Division already has at least one conference loss except UCLA.
"It would be a huge deal for us to come out and show everyone that we're ready to compete," cornerback Ishmael Adams said. "We can be known as one of the big teams in the Pac-12."
Only the Southeastern Conference, with seven, has more.