I took a screen cap with my phone (shown below) of Will Wink Strong Free a Cover-1 type of defense played by the Chargers.
C1-Chris Culliver
C2-Breeland/Amerson/Hall
FS-Dashon Goldson
SS-Ihenacho/Jeron Johnson
S-Trent Murphy
E-Stephen Paea
N-Pot Roast
E-Hatcher
W-Kerrigan
M-Riley
Mo-Keenan
This defense is one of many concepts found in the Chargers/Barry's or any defense. The Chargers website took down the video on Barry explaining this defense but here is a quick re-cap:
Will Wink Strong Free is the chargers version of a common Cover 1 Man defense often called "Robber"
Cover 1 has a single high post safety playing deep in the middle of the field or "hole".
The underneath defenders are in man to man. In the "robber" defense another defender 'plugs' the void underneath the FS.
A more detailed breakdown of Cover 1:
NFL 101: Introducing the Basics of Cover 1 | Bleacher Report
4-Man pressure with the Kerrigan (1-gap DL)
Ihenacho moves down creating an 8 man box
Corners are in man
Trent has TE man to man
Dashson plays single high deep FS
Ihenacho-Riley-Robinson are responsible for the 2 backs out of the backfield and 'plugging' the underneath hole
IF both running backs flow to the right then Ihenacho is the plugger
IF the backs split then Ihenacho has the back to his side, Robinson has the back to his side and Riley is the plugger etc...
I wish the video was still up, but one thing Barry mentioned he likes this defense because its good vs the run and the pass.
I never did a breakdown or kept track of how often Haslett played with a 2-gap front on 1st down.
But imho one of the downfalls of playing Okie (2-gap) base on 1st down is the lack of pressure compared to playing 1-gap when/if teams pass on 1st down. Sure Okie is stout against the run but in the modern NFL more and more offenses pass on 1st down.
So playing in a 1-gap front with Pot roast clogging the middle and Hatcher and Paea on the Ends getting upfield and Kerrigan coming from the Edge they should have a good rush going if its pass.
Thoughts?