Spread and Pro-Style offenses utilize a Tight End versus three-down defenses because the defense lacks a natural adjuster. Unlike a four-down defense that can distribute their anchor points evenly across the formation, the 3-4 lacks the extra lineman to defend the extra gap (hence the name “Odd Front”). When faced with an 11 personnel formation, many 3-4 defensive coordinators choose to spin to single-high coverage to gain an extra man in the box. Another adjustment for many DCs in this situation is to attach the outside linebacker to the TE’s side. With the loss of a coverage man and overhang, the DC is forced to spin. When defending an 11 pers. offense from a 4-2-5 or 4-3, these little adjustments aren’t needed because the anchor points are evenly distributed and don’t need to be created.
In a four-down scheme, the defensive ends act as the walls of the box. When a TE is introduced into the formation, the DE to the TE’s side moves to a 9 technique (unless it is Trey and then he is in a 7 or 6i). The four defensive linemen allow the defense to stay even and adjust with the linebackers and secondary. The evenness of the four-down is why many spread teams attack 4-2-5 and 4-3 defenses from 20 pers., utilizing an H-back. In 20 pers., the offense can use the “H” to attack either side of the defense, reading the overhangs to determine what play to run. If the “H” was attached to the formation (TE) he would lose his two-way go.
Defending 11 pers. formations from a 3-4 boil down to understanding how certain fronts react to the extra gap. From a single-gap fit 3-4, a defense can easily adjust to TE sets and stay within a two-shell scheme. The lack of an adjuster is an issue, which is why many 3-4 teams that face the spread, and Pro-Style spread, choose to defend from an Okie Front because it reacts much like the four-down Under Front. Using the offense’s formations as a guide, it is easy to build simple rules within the defense, setting the strength and when to attach the OLBs, to alleviate the issues seen in many 3-4 defenses. Combining an Okie Front with a match quarters scheme can adapt and flex with any formation an offense throws out, it just boils down to how a DC chooses to line up.