But the size of the team was never a state secret and yet no one shut them down like Bill managed.I don't even think it was all that difficult. He knew that the Rams defense was undersized, and so they needed to make sure they made the Rams pay for that deficiency somehow.
One thing I've noticed about great coaches and players. They can make it look easy. But when they manage it year after year while almost no one else is doing it...There's obvious ways to do that, when you have a strong offensive line, so long as you don't fall far behind them in points, which NE never did. You just keep getting first downs. Points don't even matter because you'll get them later, so long as you get yards and first downs, you make them pay for being undersized, a penalty that they can't afford to pay all game long, unlike a rightly sized defense, which could keep paying the penalty all game long, you don't play against that defense the same way as against the Rams. The strategy is very easy and guaranteed to work if you don't fall behind them in points, and NE never did. By the fourth quarter, the Rams defense was dead on their feet, compared to how they started the game. They gave up first downs easier, and eventually points. You could see them crumbling, and the game swirling away from them ultimately, and it was due to Belichick's scheme, but it did not take genius to devise that scheme, but it did require a bit of a genius to thwart it, and apparently McVay's not.
That said, Brady should consider retiring in the off season. He was lucky that Bill kept them in the position for him to find a rally late, both against the Chiefs and the Rams. He won't manage that against the Chiefs again. You could see the difference in Mahomes once he stopped over thinking and settled into the game. It won't take him a half to manage that again. He's seen the best and he was a coin flip away from beating them and taking it to the Rams.