It boils down to an effort/hustle thing. Never giving up on a play. Some players if they can't get the quarterback seem like they just go through the motions. Others, the great ones, never give up and if they can't get the sack, they're looking for the batted pass or knock down/pressure. Watt is simply a great player doing great things.
He said it flat out on NFL network, he knows whether or not he is going to get to the QB in less than 2 seconds, at that point he stops pursuing and starts trying to get in the way..
Very smart player.
Croyle is doing the right things, cant argue with his idea here. He knows the weakness and has done a great job hiding it.