MalzoneExpress said:
When we hear 5 Technique how are we to know what is meant unless the speaker identifies the system he/she is using? When a pundit claims a defensive tackle is a 5 Technique, how do I know if that defensive tackle is a 2 gap player or a one gap, edge player?
I think when pundits say so-and-so is a strict 5-technique, they are describing a pure 3-4 defensive end. Basically saying this player is probably not a three down player, i.e., not quick or explosiveness enough to kick inside as an interior pass rusher or further outside of tackle as a pure edge rusher out of a team's non-base defense. It also means he may not be big or stout enough against the run to play defensive tackle in a typical 4-3 scheme (and certainly not nose tackle in a 3-4).
While being familiar with the terminology can be helpful, football lingo is extremely fluid. One coach's
12 personnel is another coach's ace personal. Forget the designated techniques when watching a game - generally, you just need to look at a defender’s alignment with the offensive line to figure out gap assignments. If aligned head up with the offensive lineman, he’s likely responsible for the gaps to both sides. If aligned more in the gap / shaded toward the shoulder of the offensive lineman, he’s likely responsible for that single gap.
It also helps to pay attention to the linebackers pre-snap. Even though they often play off the line of scrimmage, linebackers (and safeties that drop into the box) have gap assignments against the run. For instance, here’s a 3-4 defense against the run:
LILB* RILB*
LOLB LDE NT RDE ROLB
D C B A A B C D
TE OT OG OC OG OT TE
Here, there are 8 gaps to cover but only 7 defenders:
LOLB = D Gap
LDE ("5-tech") = C Gap
LILB = B Gap
NT (head up alignment with center) = Both A Gaps
RDE = B Gap
RILB = C Gap
ROLB = D Gap
So in the above defensive front, the 5-tech LDE is likely playing one gap (the C gap) against the run while the LILB fills the B gap. Where it gets tricky is that one team’s 3-4 defense can be different than another team’s 3-4 defense. Moving a defensive lineman or linebacker just a few inches can change the philosophy of a defense entirely. I think that is when watching the middle linebackers can help a lot. If that LILB is aligned to the inside shoulder of the offensive guard instead of directly in the B gap, it's more likely that the LDE is responsible for both gaps against the run even if shaded on the outside shoulder of the tackle pre-snap.