"They played six on the line all day, which kind of limited the space to get the runs in there," Rams left tackle
Andrew Whitworth said. "They played an open-field 6-2 almost, but with one guy in the middle -- almost a little bit of goal line. And they played a lot more zone than they played all season, so that kind of shook it up a little bit."
That was the key difference. The Patriots' defense played more man coverage during the season than any team in the league. But Sunday night, New England was in zone on about 40 percent of its defensive plays. That might not sound like a lot, but it's a lot more than the Patriots showed in any game film the Rams were able to watch the past two weeks, and it worked.
"When they start running zone, you've got to hold it a little bit," Whitworth said. "And then they end up rushing six guys -- all NFL rushers, all guys who can rush in the NFL -- somebody's going to have a mismatch somewhere."
The results were a bit similar to what happened to Goff and the Rams in their Week 14 loss in Chicago. That night, the
Chicago Bears played a bunch of zone concepts and intercepted Goff four times in a
15-6 victory. Until Sunday night, that point total was the Rams' lowest of the season -- by 17.
"They mixed it up," McVay said of the Patriots' Super Bowl game plan. "In the early downs, all they ended up playing was some single-high buzz structures and some quarters principles. Then on third down, they had their designers and things like that. It was a great game plan."
http://www.espn.com/nfl/story/_/id/25920798/how-patriots-defense-stymied-sean-mcvay-super-bowl-liii
You give Bill B 2 weeks to prepare and he'll take away your #1 threat. The Rams couldn't adjust.
Once the ground game was neutered, the Rams lose that ability to try to trick you with misdirections and presnap motions.