Everything looks good on paper in theory, but in practicality isn't always as easy.
The biggest issue our Defense has is personnel, not Coaching.
The majority of the big plays that get made against the Defense are as a result of missed assignments. People have convinced themselves that Guidry just calls plays intentionally to let opposing Offenses get big plays, but that's not at all what happens.
What Lanning was saying is that on 3rd & longs he primarily isn't going to panic with his calls because he can simulate pressure with specific Zone coverages & not be forced to play Man, because he believes they can get to the ball ahead of the sticks & tackle before any RAC yards can get the Offense a 1st down. That's how most DC's go about handling 3rd & distance, the problem is, we can't assume that if we drop back in Zones playing Palms or Quarters on the outside that if the Offense throws a quick 5yd dump off that it still won't get a 10yd first down. Because we struggle immensely with ball pursuit & open field tackling.
Guidry is well aware of this, so his coverage calls have to be more Man oriented because the likelihood of our LB's & DB's making an open field tackle even with the ball in front of them is less than 50%. So, Guidry isn't going to call a ton of Cover 3 Deep, Cover 2, Cover 6's etc, because our DB's don't bail & pass off properly. When they have to play Quarters they give a ton of cushion & get flat footed when the WR gets a 3 or 4 or 6 route. So as soon as the WR makes the catch, he turns & stiff arms up the sideline for an additional 4+ yards, or they backshoulder our CB's on the sideline.
Defending screen plays is 100% film study & recognizing screen presnap, based on alignment, reading the tackles (depending on which OT is offset is usually your indicator) & reading motion. Your Rover is supposed to communicate with your LB's to tell them what keys he's identifying presnap & the LB's are supposed to communicate to the Safeties what to look for based on what they're reading upfront, so they can check in & out of specific coverages for that play.
What's happening with us, is teams are presnap motioning us to Death to confuse us & get our weakest players (Mike LB, Nickel/STAR) in one on one no man's land situations. We're one of the few Defenses I've watched this year who get confused while in Man coverage on how to cover the motioner. For whatever reason they switch off & give the motioner to whoever is covering on that side of the hash & due to lack of communication, someone's man gets left wide open because the person who's supposed to pick up the switch off didn't know who or where he's supposed to cover.
Again, because people don't know what they're watching, their first instinct is to blame Guidry, but I'm 110% sure, if our players played sound assignment football on snap by snap basis, at least 75% of the big chunk yardage plays against us wouldn't happen.
Our guys routinely get caught looking, or just get flat out walled off in blocking because they're not beating the blockers to the ball. The way you blow a play up before a Blocking convoy can fully formulate, is by identifying early what the play & is reacting off instinct. That can only come from film study & knowing exactly what's happening on a play by play basis. Great Defenders can predict plays & beat blockers to the ball & they do this by recognizing tells that the Offense has. Every offense has ways in which they tip their plays, if you watch enough film, you can accurately guess 80+% of the time whether it's a run or pass. And if you really study tendencies & play sequencing, you can predict where the ball is going on specific downs.
Offenses are repetitive, they run the same plays over & over again, just in different variances. If you figure out what their core plays are to move the ball down the field, you can get ahead of them on down & distance because you intuitively know, "It’s 3rd & 7+, they usually run this play to this side of the hashes, at this specific part on the field & usually such & such is getting the ball. They're lined up in this formation & the LT has his left foot back, so they're probably going here.." Then you communicate with the rest of the Defense depending on which unit you're in & tell them what to watch for.
If you're a CB, depending on the coverage, you need to have eyes on the WR & be ready to flip to get in phase immediately if you're playing press Man. Once you're in phase, don't even worry about the WR anymore, just keep running & locate the ball. If you can't get it at its apex, then play through the hands & disrupt the catch point.
If you're playing Off bail, then you need to have eyes on the QB. If you're on the Boundary side, then you simply position yourself to outside leverage so that he can't beat you down the sideline. If you're on the Field side, then you need to communicate with the Safety that he needs to watch the QB's eyes as well & if it's a Bang 8 or a Dig, he has to immediately crash down to either undercut or meet the WR at the catch point. If it's Post or a Corner/Flag route, he needs to fade over top & cut off the WR at angle so the QB can't teardrop the ball to him. The CB in Quarters in a down & distance play, should jump everything that's 6yds & under. If the route is 7yds or more, get back, keeps eye on the QB & press the angle towards the sideline to cut off the WR & force a route stoppage.
For LB's & Safeties it's similar. Everything boils down to eye discipline & play recognition. If you know what you're doing, & what the Offense is doing, it's a lot harder for them to make plays on you.