Knight displayed flashes of his potential — especially in the run game — during his two starts, but struggled mightily with his arm.
He completed less than 45 percent of his pass attempts for only 205 yards, four touchdowns and three interceptions.
“We didn't play as efficient as we're capable of — or what we showed today — the first two ballgames,” co-offensive coordinator Josh Heupel said after the Tulsa game. “Some of that's the quarterback. Some of that's the guys around him.”
Stoops made a quarterback change in the fourth quarter of the Sooners' second game. The switch, Stoops said, was made because of both Knight's performance and a knee injury he suffered on a late-first half quarterback keeper.
Knight was ruled out for the Tulsa game, giving Bell an opportunity to seize hold of the job, which he did.
OU is off this weekend, but Bell will start Oklahoma's Sept. 28 game at Notre Dame.
“You can't simulate live action,” Stoops said when asked if Bell showed anything against Tulsa that he didn't in preseason practices. “Everything we saw leading up… I've always said Blake could throw the football. Everyone finally got to see it. He's always thrown it well in practice. And so do the other guys. At the end of the day he took advantage and he was excellent when he was on the field.”