Ideally , the 4 - 3 defense will create pressure on passers .
Ideally , the 4 - 3 defense occupy the offensive line in run defense , while the linebackers either drop into coverage to control the middle of the field , or make tackles in run defense .
Ideally , the 4 - 3 defense will create pressure on passers , or occupy the offensive line in run defense , while the linebackers either drop into coverage to control the middle of the field , or make tackles in run defense .