OL question . . .

[NURoseBowl]

This may seem like a stupid question, but I'm not well-versed in the nuances of line play (techniques, footwork, leverage, hand placement, etc.) and I wonder if any of our more knowledgeable posters can educate me a bit on this. First, I'm wondering about specific skill sets/physical attributes required (or at least desired) in order to be, specifically, an effective run blocker, or "road grader", vs. what you'd look for in an effective pass protector. Then secondly, which of our O-linemen do you consider to be our best at these specific responsibilities?