Rosen took second-team snaps to open training camp, the latest sign that the Cardinals are priming to get him up to speed quickly. (He did get a few first-team reps late in the session as Bradford took a couple plays off.) Rosen said he's still thinking a lot on the field and once that calms down, his talent will begin to shine through.

"Sometimes you're so worried about getting the ball out and not getting sacked, you might put the ball in a sketchy situation," said Rosen, who threw an interception in a seven-on-seven drill on Saturday. "The way I'm going to go about fixing that is mastering the playbook. When you walk up to the huddle (and) the only thing you have to worry about is the defense and not what you're doing, it makes all of your decision-making a lot easier, quicker and more deliberate."

Bradford's skillset has never been his downfall, but his health. While Rosen seems unlikely to wrest away the starting job heading into the season, he pledges to be fully prepared if an injury strikes.

"Football is a very violent sport, particularly over any other sport," Rosen said. "Injury rates are basically at 100 percent throughout a career. Even if (Wilks) said, 'Josh, you're 100 percent the backup,' I'm still going to practice like the starter because I very well could be in there, and vice-versa with whoever is starting."

If the Cardinals didn't have a player with Bradford's talent on the roster, there would be a clearer path for Rosen to play immediately. Even so, Rosen is happy with the arrangement.