Many years ago, and yes I am qualified to make the following statement . . . .
Green Bay Packers had a head coach that would run a particular play as many times as it took for the defense to stop his team from gaining yardage. Pulling guards that had a nasty disposition and loved to "pancake" linebackers that chose to get in the way. Running backs like Jim Taylor would make it a point to put his cleats into the downed linbackers chest or backside, and I might add, with a smile on his face.
Vince Lombardi was the head coach, which I am sure most of you knew.
I like what I see from Will Friend's "pulling guards". They seem to have captured that "nasty" disposition that is feared by many linebackers. Right behind that guard is #3 coming down the tracks, and I know he would put his cleats in places to make linebackers think twice about the next play. Also have a walk on fullback that is truly nasty and understands blocking 101.