Are you watching Belichick's game plan? A healthy dose of Cover 2 and taking away the underneath throws to force Brock to throw into a tight window or force throws over the top where the Pats safeties are waiting (top 5 duo). It's not as easy as you think. That's why it's so important to establish the run game -> playaction to keep the defense honest. But the o-line nor BOB have done their job so far.
It's an idiotic challenge!!! You don't waste one on 7-8 yards. We're now 1 missed challenge away from being out of them for the game.