When Gray didn't have the ball teammate Christine Michael chewed up his share of yards. Michael gained 121 yards and two touchdowns -- including a 44-yarder on the Aggies first possession of the second half -- on 22 carries.
"It was a big win for us," Michael said. "We played as a team, defense and offense, special teams, we all had a great night."
Johnson came into Saturday night's game leading the Big 12 with 16 TD passes and was second in the league with 315.5 yards passing per game.
The Red Raiders' offense appeared flat in Potts' first start since sustaining a concussion Oct. 3 against New Mexico. He was 25 of 36 for 310 yards and two touchdowns before he was pulled from the game midway through the third quarter.
Potts was responsible for three turnovers, two of which led to Aggies scores.
Texas Tech moved into the rankings for the first time this season after winning 31-10 at then-No. 15 Nebraska last week. Steven Sheffield, the backup who made his second career start in that game, was in street clothes and using crutches on the sidelines Saturday night.
Fans chanted "no more Potts" shortly after Terrence Fredericks' interception in the end zone just before halftime.
Leach said his players let their guard down.
"If you have a ridiculously weak opponent, you might play bad and overpower them, but you can't do that against a tradition and a program like Texas A&M," Leach said. "If it was easy anybody could do it. If it was easy, I'd be coaching the Swedish bikini team and I'd have them coming out here to do all this."
Potts committed his third turnover when he fumbled on Texas Tech's second possession of the third quarter. Linebacker Von Miller hit Potts from behind and the ball was recovered by Tony Jerrod-Eddie on the Red Raiders 33.
"I don't think Potts ever got in a rhythm," Leach said. "I don't know if he tried to make too much happen. ....just looked, you know, slow and statue-like."