The thinking when the Raiders traded for Matt Schaub in March was that the quarterback would start this season. That's still the plan, but as head coach Dennis Allen said, "Everything is written in pencil."

Oakland finished its third week of offseason practice Thursday, and rookie Derek Carr has been very impressive. Good enough that he just might push Schaub for the starting job in training camp and cause the Raiders' coaching staff to reach for the eraser.

Allen and offensive coordinator Greg Olson were excited about their second-round pick when they drafted him last month, and Olson said Carr has been "better than we thought he would be."

The Fresno State alum came into Alameda behind Schaub and second-year player Matt McGloin, and he already has started taking away second-team snaps from McGloin.

"I really, really like him," Olson said of Carr. "Everybody knew he was accurate, but he is more accurate than we thought. ... We'll have to wait and see how he does against a live rush, but so far, his intelligence, accuracy and quickness in getting the ball out (have) been excellent."

After a 2013 season in which Matt Flynn, Terrelle Pryor and McGloin all struggled at times, the Raiders pounced when the Houston Texans made Schaub available.

"When we got Matt Schaub, we needed to do that," Olson said. "We didn't know who would fall to us in the draft. It was a good decision."

Carr, who played in a spread offense the last two years at Fresno State, was supposed to sit and learn behind Schaub and maybe even McGloin, who started six games last season.