The others. And this is where it gets tricky. Double-team Gronkowski, as you probably need to quite often, and you end up in solo coverage against three other targets: running back Dion Lewis or receivers Julian Edelman and Danny Amendola. And this is just the pass game as running back LeGarrette Blount is effective inside.
In almost every game you can see a defense doubling Gronkowski, only to have one of these other targets running to the same area, finding a crease in the defense to run after the catch. Because they can keep two tight ends in the game, they can create matchup problems by splitting Lewis out wide, getting him matched against a linebacker.
It’s not necessarily new, but it is highly effective.
“Everyone does it," Hall said, "but the level they’re doing it at over the last couple years is unparalleled to anything anyone else has ever done."