xwalker
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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.
I'll admit that before Parcells came here, I always thought the 3-4 was cool in that either OLB could rush which seemed like great concept in theory; however, after Parcells, Wade and RR, I realized that the devil is in the details.
Spencer dropped in coverage 3x more than Ware and played the run in more of a read-and-react style than Ware. They often allowed Ware to abandon run contain by covering for him with an ILB; however, Spencer never got that luxury. The theoretical threat of rushing from either side was more theoretical than practical. A majority of Spencer's pass rushes came from the 4-man line.
Considering that teams are in Nickel more than base these days, the 3-4 alignment seems limited in terms of total number of snaps played in that alignment. I really don't see the point.
With Marinelli's 4-3, the entire DL is shifted to the right which puts the WDE farther out from the OT and allows for smaller players to function there. It also shifts the SDE inside which is why Marinelli ended up going to Crawford in that position after 2 or 3 games last year in order to shut down the run.
I noticed they experimented with some things in the HOF game that I have not seen much of in the past. They sometimes had Moore play from a standing position. Also, they had some snaps where the LDE was far outside, the RDE was more inside and a LB was up on the line next to the RDE. I think they might have used #68 (A DT/DE tweener) at RDE on those alignments.
There are plenty of ways to add in creative elements to the 4-3 without the need to switch to a 3-4.