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Kolb made a very positive impression during Clayton's recent trip to Cardinals training camp at Northern Arizona University. Kolb also impressed when I visited Cardinals camp earlier, more for his demeanor and leadership potential than for the limited snaps we've seen him take for the Cardinals during practices and the team's lone preseason game.
Injuries stand out to me as the biggest threat to Kolb, who suffered a concussion in the Philadelphia Eagles' 2010 opener. He's no lightweight at 6-foot-3 and 218 pounds, but my first impression at practice was that Kolb was slimmer than anticipated through his lower body. It was just an impression. No matter how frequently coach Ken Whisenhunt downplays fears over Arizona's offensive tackles, those fears exist for a reason. Levi Brown and Brandon Keith have not demonstrated over time an ability to protect the passer at a high level by NFL standards.
We're all projecting, obviously, and I'm more conservative in making assessments based on practices and games that do not count. There's every reason to think Kolb will easily clear the low bar set for him by Arizona quarterbacks last season.
A stat to consider: Kolb tossed six touchdown passes in four starts last season. The Cardinals had 10 touchdown passes in 16 games.