3-4 was developed initially as a defense geared towards stopping the run. Many brilliant playcallers like Wade Phillips, Marvin Lewis, Dom Capers and others have made modifications that have led to prolific pressure defense. However a 3-4 presents schematic disadvatages that are ruinous in todays NFL.
We provide a good example of this this going back 11 years to 2006 when Greg Ellis tore his achilles and our defense our pass rush became instantly ineffective because all an offense had to do to take Ware out of the game was motion a TE to his side which put him in coverage. The career of Anthony Spencer is another more recent example. When given duties as the main pass rush threat, Spencer came through (late 2009, 2012). However because we always ran a 3-3-5 in sub packages, we rarely were able to rush both Spencer and Ware at the same time. Having Ratliff playing at a Pro Bowl level helped alleviate the disadvantage, but one of our better pass rushers wasnt getting proper rush opportunities. Most (if not all) 3-4 teams have abandoned the 3-3-5.
all these schemes need to fit the players you have.
my main point is acquiring blitzing LBs is much easier than DEs.
then make your scheme utilize these players.
have them involved in an aggressive attacking fashion.
overload various gaps and dictate the action instead of reacting to what the TE does.
let the zone coverage deal with the receivers and TE.
there are no definites in scheme.
if the DC is stubborn and inflexible like Marinelli, he is most likely an obstacle that needs to be booted.
we still do not have a run stuffing 1tech.
olbs like the GB FA and Watt are ruled out by scheme.
the stated need to project Watt means Marinelli wants the player to adapt to his scheme instead of his scheme adapting to the player's strength.
we shall all see.
if the pass rush makes progress, all is wonderful.
if not, imo a change is needed.
with the contracts in 2018, it is easier to transition to a 3-4 type scheme.
that does not mean you play no 4 DL fronts or other schemes.