Somebody explain to me how a different DC is gonna make our DL quicker, stronger and more explosive and not get owned at the LOS. Somebody enlighten me on how a new DC is gonna make our LB's and DB's faster and more fluid.
Cheese u are the type of person that only hears what they want to hear sometimes. So i will type this again.
If we have our DL assign a gap for penetration only, vs catch and hold. You will quickly see how much better they look disrupting gaps vs holding onto OL so the Lb can clean up.
Let me try again. Some DC prefer their Dl hold a lane and tie up OL. Roof. Groh. This can be done in both 1 and 2 gap assignments. This philosophy was confirmed and proved via comments by our lb in ajc articles this year as to the role of the dl in this scheme. The tape doesnt lie either. This concept is supposed to be friendly for your Lb. You can call it LB centric. In the system DL doesnt get many tfl or many sacks. It all goes to the lb. and it makes your dl look slow. Sluggish. Like pillow fighters. But your Lb and dropped down S get a ton of tackles. When your Lb miss, then they look really bad and exposed. Sound familiar? It looks and is really soft but really Lb friendly. Hmmm i wonder why ted likes this style? A funny note though. This technique is great against the screen game. Yet we struggle there. So that is either on the players or lb coaching.
Now. There is another DC philosophy where each dl each play is assigned a gap for penetration. The gaps not assigned are then assigned to the Lb and maybe S. Note. This may not be EVERY play. But its alot of them. And at snap. The sole objective of the Dl is to hit that gap as hard as he can to disrupt (not worry about tieing up a specific Ol position) It may only be 2 dl that do it one play. It may be 3. Or all 4. The idea is to get the Ol to react fast to that leaving lanes open for blitzing lbs or expose blocking schemes that give the d favorable mismatches. Again. How this is done play to play changes on the play. But no doubt the dl in this scheme has one objective. Come off the ball hard and fast to you assigned gap and blow it up. Force a double team etc. force the rb to spill sideways from the los. In this scheme it is critical to maintain that lane or fit. And often you will see a DL upfield running right by the ball carrier on a counter because he was trying to destroy his gap and as a fan you go wtf. But this scheme allows your dl to have more tfl. More tackles. However. It requires more from your lB and they usually have 1 of the 3 lb always assigned to taking on a ol block vs the dl trying to tie up so the lb are free to roam.
Do u get it now? How a dc philosophy on the line can help who you have on the line appear to be more explosive and strong at snap vs pillow fight and dance? Too often people like to call this a one gap d; and it is. But its attacking that gap vs holding the ol.
Each philosophy can work. Both are tried and true. The former is way more common in nfl (heavy screen game alot of dl talent) Especially for dts and sde. The latter is attacking and aggressive and can leave a backend exposed. Its why tenuta was almost always in cover 3. But its nice because it allows a team to have leaner dl for penetration of gaps and doesnt require a dl to purely win head up on the ol each play.
Which is why it fits tech better. And its why a dl can look alot better on tape. With the SAME personnel. Now will it mean we are top 15 d all of a sudden. No. but imo our 3rd down get better and we go from number 70 d to top 45 or so with our talent.
This is why coaches, coaching and scheme matter.
Shouldn't they have been immediately better once they rid themselves of Roof? Because apparently all any team needs for a top 20 D is the right DC. 
