Thanks, so the key things to remember is even numbers are heads up on the OL, odd numbers are on the outside shoulder and even number i's are on the inside shoulder? What if the nose plays on the outside shoulder of the center? Also, it looks like there's never an alignment that's in the middle the gap?
then he is in 2i. If the nose is straight up on center he is two gapping, not aligned in a gap. You have to consider the defensive scheme with alignment. If you are in a 4-3 you rarely run a 0 tech. You are in 2i and 3 tech for your 2 DT's. 2i, or shade inside of the guard is a Agap control. Its basically lining up in the A gap in a 4-3.
As an example. in a 4-3 a 3 tech DT has one responsibility (if not stunting) and one only. And that is to control the B gap. Usually on the strong or TE side of the formation. So here it is like the 2i with the A-Gap but on the B-Gap.
Now a 3-4 0Tech has both A gap responsibilities, hence the head up alignment. He doesn't shade a 2i really ever, or if he does then the MLB is playing a 20tech.
A 3-4 3tech also has B-Gap responsibility on the strong side, but next to him is a OLB filling the C gap. A 5tech in a 3-4 has both B and C gap control.
A 4-3 base has a 3tech, 2i, a 5tech and 7tech. The 2i and the 5 usually on the weak side and the 3 and 7 or 6 on the strong but it depends on the LB alignment.
Simply put there are more gaps than DL, and how the DL is gap assigned is not in a vacuum....what is the O formation and what is the LB fit?
4-3 single gap is like I said above. Typically in our scheme, one DT owns one Bgap. The other has the opposite side A gap. An end is responsible outside of tackle shoulder or 6 split with a TE (cgap) the other end may be in a 4 or 5 on the side of the 2i gapper looking at either the c or b gap depending on the OLB. The MLB has the other A-gap that the 2i isn't covering. The 3tech has the B and the DE has the C with the other OLB owning the TE and Dgap.
So weak to strong the assignment looks like this in a run fit. This can change of course with stunts and fun stuff like zone blitzes etc etc. But this is a classic run fit vs 21 or 11 personnel. Run keys read the gaurd to the FB or RB
OLB - C (but he is off the line)
DE - B but can go to C depending on OLB rotation (this is his run key)
DT - A
MLB - Strong A
DT - B
DE - C
OLB - TE/D
the strong OLB is usually playing a 70tech (on the line) due to the TE.
Another reason you don't see a pure A-Gap alignment in a 4-3 is because that is MLB assignment...the center gets him and he gets the center....unless the 2i is crossing the face of the center or the center is doubling the 2i DT with the guard...something Wofford did to green alot! This leaves the MLB open for the opposite A-gap usually then assigned by the slanting OT or releasing guard, something wofford did nicely.