I put in a question to Ross Tucker of Sports Illustrated regarding mobile QBs and their sack rates. The link is here:

http://www.bigcatcountry.com/2009/7/3/936752/james-harris-reference-check-from

My question and his response is here:

Could you comment on the issues that a 'mobile' QB creates for an offensive line in pass protection? I have noticed that various athletic and mobile QBs (Daunte Culpepper pre 2005 injury, Mike Vick, Matt Cassel, Ben Roethlisberger) seem to have a high number of sacks, even though they are considered to be very elusive and tough to bring down. Is it all on the offensive line for the high number of sacks?
--No name given, Corunna, Ontario

In my experience offensive linemen typically get excited when they initially work with a mobile quarterback because they feel as if that will help them give up less sacks, i.e., if they get beat, the quarterback may be able to avoid the pass rusher. That excitement, however, quickly gives way to the reality that a lot of times scrambling quarterbacks rack up higher sack numbers because they aren't always where you expect them to be when you are blocking for them and their confidence in their mobility leads them to try to extend plays when sometimes they should just cut their losses.

Ultimately, the most offensive-line friendly quarterbacks are the ones that get their team into the right play or protection at the line of scrimmage, set up in the pocket exactly where the linemen expect them to be, move subtly in the pocket to avoid pressure, get rid of the ball on time, and if all else fails, throws the ball away when nothing is there.

I asked Ross because as a former NFL offensive lineman I wanted to get his perspective of his experience on the field. Also, I enjoy his writing a lot. Since Paul Zimmerman [Dr. Z] had his stroke, he is [in my opinion] the only SI.com football writer worth reading.

NOTE: Anyone who has seen my posts knows this is a recurring theme for me. I did not post this to make a point, but to just get another opinion from someone who I respect and is far more knowledgeable than me.

Also, I put in my name as North Left, but apparently SI.com does not believe that is my real name.