The Pats prior to the 5 yard run
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The Patriots goal line runstop formation after subbing in more heavies
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The Patriots have an 8 on 6 advantage in the box. Every gap is covered on both the inside and outside with a linebacker waiting to fill whichever middle gap Seattle's line attempts to vacate.
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Vince Wilfork, Sealver Siliga (who, by the way, would've known Seattle's run plays as a former Seattle DT if you think passing was unforgivable due to Browner), and Alan Branch are on the line.
Siliga and Branch are at the 2i on each of Seattle's guards. They're threatening to absolutely destroy the A gap and they're both 350 pounds.
Vince Wilfork is at the 4i on Okung's inside shoulder. Vince Wilfork has that B gap. He's Vince Wilfork. Vince's 4i alignment puts pressure on Carpenter's outside as well, and he already has a 350 pound man threatening to wreck his inside.
Chris Jones, a 300 pound defensive tackle, is lined up at the 4t directly over Britt.
From there, you have star LB/EDGEs Jamie Collins and Chandler Jones absolutely smothering the C gap on the left with a helpless Luke Willson splitting them.
Rob Ninkovich, a strong off-ball linebacker, is covering the C gap on the right.
If that wasn't enough, yet another great linebacker (a prime Dont'a Hightower at 24 in his third season) is sitting at the second level, ready to further obliterate whichever gap Seattle might foolhardily attempt to go for on the ground.
There's just no good defense for running the ball here from a schematic perspective. Only with the benefit of hindsight can we say "I wish I did the illogical and nearly objectively wrong thing and lost 2 or 3 yards on an ill-advised run play."