Tackles Rayfield Wright stood 6-7, and Ralph Neely weighed 265. Center Dave Manders weighed 250. All went on to block in Pro Bowls and Super Bowls in the 1970s. The same with defense. The better linemen of the 1960s were the shorter, stockier, leverage players like Willie Davis, Alex Karras and Andy Robustelli.
Long strides cover more ground in the pass rush.
A quarter of a century later, all NFL teams covet pass rushers who resemble NBA power forwards. In the days before strength and speed programs, Landry brought in Alvin Roy and Boots Garland in the early 1970s to help make the Cowboys stronger and faster. Roy was a weightlifter and Garland a college track coach. Now every NFL team has specialty coaches. Landry also was the first to employ a coach for quality control.