This is about how NE defended LA's run game. There's a bunch of snippets linked from various articles - it's all a lead up to why I think this tactic will not work to defend SF's run game.
From the article that linked in the OP:
Belichick featured a second schematic wrinkle: 6-1 fronts. New England's outside linebackers aligned up on the line of scrimmage, taking away the edges that L.A.'s foundational outside-zone runs aim to exploit.
https://www.theringer.com/nfl/2019/2/4/18211043/the-starting-11-patriots-rams-bill-belichick-wade-phillips-defense-super-bowl-liii (about the SB)
Rather than have inside linebacker Dont'a Hightower (MLB) head downhill at the first sign of run action, Belichick and Flores instructed Hightower to react to the run in a more controlled way; he stuck to the middle of the field, which slowed play and allowed him to maintain his coverage responsibilities on play-action throws. That hesitation was possible only because the Patriots had devoted so many bodies to their defensive front.
This is a good article that shows just how heavily McVay plays 11 personnel (highest in NFL 77%):
https://www.theringer.com/nfl/2019/1/10/18177030/rams-sean-mcvay-jared-goff-todd-gurley-11-personnel
The shift to this version of the 11 personnel strategy didn't happen right away. Over their first three games of the 2017 campaign, the Rams used the grouping on just 58 percent of their snaps. But during weeks 4 and 5, that figure jumped to 74 percent. From weeks 6 through 10, it climbed to 78 percent. And finally, from Week 10 on, it jumped to 94 percent, completing the unit's transformation into the offense we see now.
11 personnel vs 6-1 front. The OP article stated that Hoodie did this to defend the outside zone run. GCamper mentioned earlier, the adjustment is to run up the middle. There's only one second level defender. Bust through and it's a nice gain.
NE is in an Over front with their DL. OLBs on the line.
The red defender is there to protect against the jet sweep. There's no way that the other WR (behind the TE) is going to lead block up the middle on 54.
DL holds their ground and there's the RB sees minimal room up the A and B gaps. +3
While there are benefits of this (exclusive 11 personnel), explained in the article, one thing it sacrifices is diversity in the run game. To bring this back to the 49ers, one huge difference between what Kyle does and what McVay does is use of the fullback.
Here is Hoodie himself talking about what the FB brings to the run game:
http://blog.masslive.com/patriots/2018/11/bill_belichick_loves_fullbacks.html
"But whether he carries the ball or doesn't carry the ball, the blocking angles from the backfield are different from what they are from the line of scrimmage."
To sum it up, he's talking about how a fullback gives the versatility to move around, giving you an extra blocker to throw at the point of attack.
More Hoodie (from an article that is no longer found online):
"By having them in the backfield (fullback, 21 personnel)
, you can create that same four-man surface or three-man surface after the snap so the defense doesn't know where the four-man surface or three-man surface is. The fullback has to –- he can build that from the backfield.
"And then there are also, let's say, a greater variety of blocking schemes with the fullback in the backfield because he can block different guys and come from different angles. He's (FB) not always behind the quarterback. He could be offset one way or the other and create different blocking schemes and angles that it's harder to get from the line of scrimmage.
SF led the league using 21 personnel at 54%.
SF tries to show a balanced look with the FB to one side, TE on the other. There's no tipping off of which is strongside/weakside. Which side is the four man surface?
Counter step by HB.
4 man surface (strongside) is the right side of the OL. The FB creating flexibility in the run game and adds a gap to the right side OL. Strengthen runs in the box.
QB tendency to bootleg holds the blue edge defender.
+7
All this to say that what Hoodie did against the Rams to defend the run game, would not work against the 49ers. Once NE went to a 6-1, the Rams had to run up the middle. But their lack of a true FB prevented them from getting help once NE's DL was able to hold their ground. Not saying Hoodie can't defend SF's run game, just not with this 6-1 adjustment. SF has a more diverse run game than the Rams. The use of a FB is a strength to run between the tackles. NE had the 2nd highest % at using a FB.
[ Edited by thl408 on Feb 14, 2019 at 11:00 PM ]