OL body types for zone blocking and why zone?

Zone blocking doesn't require big people it requires linemen with patience and a line coach that understands the difference in the fundamental schemes as it applies to the way the backs receive the ball. Zone blocking is a run to daylight fundamental progression. In 1985 when the full use of extended arms in advance of the body was excepted and approved zone schemes truley took off. I work with line coaches from around the country at all levels and the one aspect of the success of zone blocking is: does the footwork apply to the way the back receives the ball and does the running back have the ability inside the scheme to cutback when presented with the opportunity. Coach CAmpbell