Posted by ESPN.com's Bill Williamson
Mid-week mail call:
A reader from Sioux City wants to know if Kansas City will rely on Glenn Dorsey this season.
Bill Williamson: I think the Chiefs are banking on Dorsey, who could move from defensive tackle to defensive end as they transition to the 3-4 defense. Some scouts believe Dorsey would be best suited for end in the 3-4. Dorsey had an unspectacular rookie season in 2008 after he was taken with the No. 5 overall pick. Still, he showed flashes and he still has a chance to be an impact player. Along with rookie defensive end Tyson Jackson, Dorsey's LSU teammate who was the No. 3 overall pick, Dorsey is considered a centerpiece of the Chiefs' defense.
Rikki asks if second-year player Chaz Schilens has a chance to be the No. 1 receiver in Oakland over this year's top pick, Darrius Heyward-Bey.
BW: It's possible. The Raiders are looking for production out of a weak receiver group. If Schilens, who started some last season after he was a seventh-round pick, makes big strides, he could be the top receiver in Oakland. He is a big, strong player who has potential to be a No. 1 receiver. But right now, it would be difficult to count on Schilens to be a premier receiver right away. Still, Heyward-Bey will also likely have his growing pains as Oakland tries to find a winning receiving rotation. Johnnie Lee Higgins and Javon Walker, if he can stay healthy, should also be in the mix.
Chris from Springfield, Mo. wants to know if Tyler Thigpen has a chance to be the Chiefs starting quarterback over the newly acquired Matt Cassel on opening day.
BW: I would be shocked if Thigpen beat out Cassel in training camp. I know the Kansas City brass has said it will be an open competition, but there is little chance Cassel will lose this job. The team is being built around him. Thigpen did a solid job at the start of the second half of last season. Still, the new leadership in Kansas City wants Cassel to be the quarterback of the present and the future. He will get every chance to prove himself.